A categorized directory of free libraries and tools for Android (1508)

2D Engines

• AndEngine
• cocos2d-android
• cocos2d-x
• flixel-gdx
• MaterialImageView
• PlayN
• Pure2D
• Rokon
• SDL
• YoghurtGum

3D Engines

• Dwarf
• Godot
• Irrlicht
• jMonkeyEngine
• jPCT AE
• libGDX
• Linderdaum
• min3d
• MonoGame
• Ogre
• Rajawali

ADB

• adb-export
• adbmaster
• ChromeADB
• fb-adb
• scrollscreenshot

ANR

• ANR-WatchDog

API

• drupalfit
• google-api-java-client
• Pollexor
• RxParse
• SpotifyApi
• ThingSpeakAndroid
• YouTubeHelper

APK

• Android PluginManager
• apk-method-count
• dynamic-load-apk

API

• drupalfit
• google-api-java-client
• Pollexor
• RxParse
• SpotifyApi
• ThingSpeakAndroid
• YouTubeHelper

APT

• Barber
• Corleone
• FragmentArgs
• GoldenGate
• HawleyRetainer
• Hrisey
• Jackdaw
• javac-warning-annotation
• Lombok
• Scopes

Activities

• AndroidKioskMode
• cwac-masterdetail
• cwac-presentation
• Dragger
• Euclid
• LolliPin

Analytics

• Google Analytics
• Piwik
• Yandex Metrica

Advertisements

• AdMob
• Google Mobile Ads SDK
• InMobi
• mMedia
• mobileCore
• MoPub
• Pollfish
• Tapjoy

Action Bars

• ActionBarPreferenceActivity
• ActionBarSherlock
• Android Action Bar Style Generator
• Extended ActionBar
• FadingActionBar
• GlassActionBar
• Header2ActionBar
• SectionedActionBarList
• SherlockNavigationDrawer
• v7 appcompat library

Animations

• Android Indicators
• Android-Image-Animator-Frame-Library
• android-pathview
• android-ui
• AndroidViewAnimations
• AnimatedPathView
• AnimationEasingFunctions
• ArcAnimator
• CircleAnimation
• CircularReveal
• EasyAndroidAnimations
• EdgeEffectOverride
• FragmentTransactionExtended
• Lib--ColorBars
• Motion
• Reachability
• Rebound
• recyclerview-animators
• RecyclerViewItemAnimators
• SmoothTransition
• transitions-everywhere
• TransitionsBackport
• ViewRevealAnimator
• WaveDrawable

Audio

• aacdecoder-android
• AndroidOggStreamPlayer
• Audio Wife
• libpulse-android
• Mini Equalizer Library
• OpenPlayer
• Patchfield
• PlayerHater
• RhombusLib

Analytics

• Google Analytics
• Piwik
• Yandex Metrica

Architecture

• Android Bootstrap
• AndroidViewModel
• BARACUS framework
• DroidParts
• Genius-Android
• GreenDroid
• Ignition
• JDROID Framework
• Ketai
• KJFrameForAndroid
• Mortar
• ngAndroid
• Paginize
• Spring for Android
• SwissKnife
• UltimateAndroid
• Velcro

Background Processing

• Android Async
• Android Deferred Object
• Android Priority Job Queue
• android-multithread
• android-promise
• AsyncJobLibrary
• AsyncService
• Bolts
• Caesar
• Coordinator
• Futuroid
• Groundy
• InteractorExecutor
• JDeferred
• NanoTasks
• rxloader
• smoothie
• Tape
• TinyTask

Backward Compatibility

• Android Device Compatibility Package
• Android Lifecyle
• android-calendarview
• android-switch-backport
• cwac-mediarouter
• GreenMatter
• HoloEverywhere
• NineOldAndroids
• PreferenceFragment
• Support Library

Benchmarking

• Benchit New

Blur Effects

• 500px-android-blur
• Android StackBlur
• BlurBehind
• BlurDialogFragment
• EtsyBlur
• ImageBlurring

Bluetooth

• Android Bluetooth Library
• Android-BluetoothSPPLibrary
• android-btxfr
• Blue2Serial
• Bluetooth LE Library for Android
• SimpleBluetoothLibrary
• SmartGattLib

Badges

• Android-ActionItemBadge
• android-viewbadger
• Bubble-Notification

Bar Codes

• Android Barcode Generator
• BarCode Fragment
• ZBar
• ZXing

Bitmaps

• SoBitmap

Bread Crumbs

• FragmentBreadCrumbs
• HanselAndGretel

Build Systems

• Apache Ant
• Apache Maven
• buck
• Gant
• Gradle
• Leiningen
• sbt

Bundles

• PrettyBundle

Buttons

• Android-Bootstrap
• android-circlebutton
• Android-Material-circular-button
• Circular Progress Button
• CircularButton
• ExpandableButtonMenu
• FabButton
• FancyButtons
• Flat Button
• HamburgerMenuDrawable
• hkm-progress-button
• IconButton
• material-menu
• MovingButton
• Process Button
• ProgressButton
• PSGradientButtons
• SAutoBgButton
• TH-ProgressButton
• TransformableDrawableButton

CSV

• opencsv
• Super CSV

Camera

• android-webcam
• CameraModule
• cwac-camera
• LandscapeVideoCamera

Caching

• Android-BitmapCache
• android-easy-cache
• Android-Image-Cache
• carbonite
• DiskLruCache
• HttpResponseCache
• ObjectCache
• Qachee
• Reservoir
• simple-disk-cache

Canvas

• Artiste

Carousels

• carousel-layout-android
• CoverFlow
• FancyCoverFlow
• MComponents

Cards

• Cards-UI
• Cardslib
• cardsui-for-android
• CardUI
• MaterialList
• Swipeable cards
• Swipecards

Changelog

• android-change-log
• ChangeLog Library
• ckChangeLog
• Inscription
• Saguaro

Color Analysis

• Alexei
• Android Random Color
• Bright
• ColorArt
• Colours

Cloud Storages

• Driven
• Dropbox
• Google Drive
• OneDrive-Picker-Android

Checkboxes

• CoolSwitch
• EnhancedCheckBox
• FlipCheckBox
• FlipView
• SlideSwitch
• SwitchButton
• SwitchPreferenceCompat
• ToggleButton

Color Pickers

• Android Wear Color Picker
• android-color-picker
• Color Picker
• Color Picker collection
• color-picker
• color-picker-view
• ColorMixer
• ColorPickerPreference
• cwac-colormixer
• HoloColorPicker

Colors

• Android-Material-Design-Colors
• Flat UI Colors

Comet/Push

• iCometClient4j

Compass Sensors

• Compass-View-Library
• CompassView

Crash Reports

• ACRA
• Crashlytics
• HelpStack
• Telescope

Credits

• AboutLibraries
• LicensesDialog

Content Providers

• Android ContentProvider Generator
• Android-AnnotatedSQL
• Content Provider Helper
• cwac-provider
• DatabaseCodeGenerator
• EasyDatabase
• Forger
• OrmLiteContentProvider
• ProviGen
• RoboCoP
• Schematic
• SimpleProvider
• sqlite-provider
• StorIO

Curl/Flip Effects

• android-flip
• android-FlipView
• android_page_curl
• FoldableLayout
• TransitionViewPager

Data Binding

• Android Binding Library
• android-utils

Data Structures

• rtree
• SimpleHashSet
• SparseBitSet

Database Browsers

• Android DbInspector
• SQLite Browser
• SQLite DB Bowser
• SQLite Manager

Database

• Android schema utils
• Android SQLiteAssetHelper
• android-db-commons
• android-lazyloading-cursor
• AndroidYboDb
• aSQLite+
• Cerberus
• CursorMerger
• dbdump
• EasySQLite
• Flyway
• RxCupboard
• SQLBrite
• SQLiteMaster
• Storm
• Thneed

Decompilers

• Androguard
• JAD
• smali

Date Pickers

• Android Week View
• android-betterpickers
• android-calendar-card
• android-datepicker
• Android-RecurrencePicker
• Caldroid
• CalendarListview
• DatePicker
• DateTimePicker
• DateTimePicker Android 4.0+
• ExtendedCalendarView
• GoogleDateTimePickers
• Material Calendar View
• MFCalendarView
• MonthView
• PagerDatePicker
• Roboto Calendar View
• SlideDateTimePicker
• SlideDayTimePicker
• SunDate Picker
• TimePicker
• TimesSquare for Android
• WinKal

Dependency Injections

• android-autolayout
• AndroidAnnotations
• AndroidAutowire
• androidInject
• Butter Knife
• Dagger
• Dart
• google/dagger
• Knork
• Kotter Knife
• LittleKnife
• Michelangelo
• Proton
• RoboGuice
• Stabbed Android
• Transfuse
• ViewHolderInflater

Design

• Android App Patterns
• Android Cheatsheet for Graphic Designers
• Android Niceties
• Android Patterns
• Carbon
• Google Android Design Guide
• google-styleguide
• HoloAccent
• ICS Apps
• Material
• Material Colors
• Material Design Android Library
• Material Palette
• MaterialUp

Design Patterns

• mosby
• Nucleus
• RoboBinding
• Singleton

Distributed Computing

• BOINC

Download Managers

• AizazAZ/ThinDownloadManager

Drawables

• DrawerArrowDrawable
• MrVector
• Proteus
• RoundImage
• SVG2Drawable

Dex

• classes.dex method count helpers
• dex2jar
• futuresimple/dex-method-counts
• Grab-n-Run
• mihaip/dex-method-counts

Dialogs

• AlertDialogPro
• Android-DialogFragments
• dialogplus
• HtmlDialog
• L-Dialogs
• Material Dialogs
• MaterialDialog
• NiftyDialogEffects
• OneTimeAlertDialog
• PostOffice
• QustomDialog
• StandOut
• StyledDialogs
• Sweet Alert Dialog

Distribution Platforms

• ADP
• Amazon Appstore
• B-Flight
• Google Play
• HockeyKit
• Samsung Apps

EPUB

• Epublib
• SkyEpub

Emulators

• Appetize.io

Emoji

• emojicon
• emojimenu
• KitKatEmoji

Event Buses

• AndroidEventBus
• fluffy-events
• greenrobot/EventBus
• MicroBus
• Otto
• stickyd/eventbus
• TinyBus

Face Recognition

• Masaccio

FRP

• reactive-android
• RxAndroid
• RxBinding
• RxJava
• RxJava-Optional
• RxJavaString
• RxKotlin

File System

• android-simple-storage
• G-Rex

Fonts

• Android Icon Fonts
• Android Typeface Helper
• android-iconify
• Calligraphy
• Custom Typeface
• CustomFont
• CustomType
• Font Awesome
• Fontain
• FontDroid
• Fontify
• Google Fonts
• MagicViews
• PixlUI
• Print
• TypefaceHelper
• VNTFontListPreference

File/Directory Choosers

• aFileChooser
• afiledialog
• DirectoryChooser
• FilePicker
• FilePickerLibrary
• NoNonsense FilePicker
• ReactiveDirectoryChooser
• simple-file-chooser

Functional Programming

• Retrolambda

Floating Action Buttons

• android-floating-action-button
• android-floating-action-menu
• Clans/FloatingActionButton
• fab
• FaizMalkani/FloatingActionButton
• makovkastar/FloatingActionButton

Fragments

• StatedFragment

GIF

• android-gif-drawable
• gif-movie-view
• GifAnimationDrawable
• GifImageView
• GifLib

Gestures

• Airy
• Android Gesture Detectors Framework
• GestureImageView
• SimpleFingerGestures
• SwipeBack

Glow Pad Views

• GlowPadBackport
• GlowPadView

Glow Pad Views

• GlowPadBackport
• GlowPadView

Graphics

• AChartEngine
• AFreeChart
• Android-Charts
• AndroidCharts
• Androidplot
• desCharts
• DroidDiagram
• EazeGraph
• GraphView
• HelloCharts for Android
• HoloGraphLibrary
• HzGrapher
• MPAndroidChart
• WilliamChart

Gradle Plugins

• AARLinkSources
• android-appversion-gradle-plugin
• android-apt
• android-check
• android-gradle-localization-plugin
• android-maven-plugin
• android-unit-test
• bugsense-gradle-plugin
• fork-gradle-plugin
• gce2retrofit
• Generify
• gradle-advanced-build-version
• gradle-android-apt
• gradle-android-command-plugin
• gradle-android-plugin
• gradle-android-scala-plugin
• gradle-android-sdk-manager
• gradle-appstore-deploy-plugin
• gradle-eclipse-aar-plugin
• gradle-imagemagick
• gradle-mdicons
• gradle-mvn-push
• gradle-packer-plugin
• gradle-play-publisher
• gradle-proguard-plugin
• gradle-retrolambda
• gradle-robojava-plugin
• gradle-versions-plugin
• groovy-android-gradle-plugin
• icon-version
• j2objc-gradle
• lint-cleaner-plugin
• proguard-please
• sdk-manager-plugin
• secondary-dex-gradle
• Triple-T/gradle-play-publisher
• victor

HTML

• HtmlCleaner
• Jericho
• jsoup
• owasp-java-html-sanitizer

HTTP Mocking

• Fixd
• JSON Server
• MockHttpServer
• MockServer
• Mocky
• WireMock

Highlighting

• Highlightify
• ShowTipsView

IDE

• AIDE
• Android Studio
• Eclipse ADT
• IntelliJ IDEA

IDE Plugins

• ADT Templates
• Android for Maven Eclipse
• Android Holo Colors IntelliJ Plugin
• Android Material Design Icon Generator
• android-codegenerator-plugin-intellij
• android-drawable-importer-intellij-plugin
• android-holo-colors-idea-plugin
• android-sqlite-model-generator-plugin
• android-studio-filetypes
• android-studio-unit-test-plugin
• android-viewbyid-generator
• bugsnag-eclipse-plugin
• ButterKnifeZelezny
• Dagger IntelliJ Plugin
• Material Design Icons ADT Template
• Otto IntelliJ Plugin
• SelectorChapek

Icons

• android-icon-copier
• Android-Iconics
• android-material-icons
• androidicons
• droidicon
• Dynamic Calendar
• IconicDroid
• Magnet
• Material Design icons
• Skycons
• Weather Icon View

Image Loaders

• Cube SDK
• DaVinci
• Glide
• image-loader
• LazyList
• Picasso
• Prime
• Universal Image Loader for Android
• UrlImageViewHelper

Image Processing

• android-gpuimage
• android-image-filtering
• android-jhlabs
• AndroidFastImageProcessing
• Glide Transformations
• JJIL
• picasso-transformations
• picasso-transformations

Image Croppers

• Android CropImage
• android-crop
• Cropimage
• CropImageView
• Cropper

Image Pickers

• Android-Ultra-Photo-Selector
• DeviceAlbums
• Laevatein
• MediaChooser
• MultiImageSelector
• MultipleImagePick
• MultipleImagePicker
• Patio
• poly-picker

Image Views

• android-combination-avatar
• android-shape-imageview
• CircleImageView
• CircularImageView
• CustomShapeImageView
• DexMovingImageView
• DSAvataImageView
• ExpandablePanel
• Fresco
• ImageViewZoom
• ImageWindow
• KenBurnsView
• LetterImageView
• okulus
• PhotographicPrintAnimator
• PhotoView
• ProMosaic
• RoundedImageView
• SelectableRoundedImageView
• Smart Image View
• SplitImageView
• Subsampling Zoom Image View
• TiledImageView
• TouchImageView

Intents

• Android Intents
• android-intents
• IntentLogger
• TrustedIntents

Instrumentation

• adbi
• ddi
• JavaPoet
• javassist-android

JSON

• fastjson
• GSON
• ig-json-parser
• Jackson
• Jackson jr
• json-parser-generator
• JSON.simple
• JsonToJava
• LoganSquare
• ModelMapper
• Moshi
• Parser
• RapidJSON

Job Schedulers

• AlarmManager
• Boogaloo
• cron4j
• cwac-wakeful
• JobSchedulerCompat

Kotlin

• androidKotlin
• Kaffeine
• KAndroid
• kotlinAndroidLib

List Views

• 2D Scroller
• Android-MultiStateListView
• Android-ScrollBarPanel
• android-youtube-listview
• DobList
• DragSortListView
• EasterListView
• EnhancedListView
• FlabbyListView
• Horizontal Variable ListView
• JazzyListView
• ListViewAnimations
• MultiLevelExpandableIndentableListView
• PagedHeadListView
• PagingListView
• PlayView
• simplelistview
• SlideExpandableListView
• SuperListview
• SwipeListView
• SwipeMenuListView
• TreeViewList

List View Sections

• AStickyHeader
• BlurStickyHeaderListView
• HeaderListView
• LetterSectionList
• ListviewFilter
• ListViewVariants
• PinnedSectionListView
• PullZoomView
• Recyclerview-stickyheaders
• StickyGridHeaders
• StickyListHeaders
• StickyScrollViewItems
• StikkyHeader

Localization

• Android Localization Helper
• android-localization-helper
• Twine

Location

• Android-GoogleDirectionAndPlaceLibrary
• Android-ReactiveLocation
• geo
• google-places-api-java
• Smart Location Library

Layouts

• Android Constrained Widgets
• Android Empty Layout
• Android Slide Show Widget
• android-gridlayout
• AndroidSwipeLayout
• AndroidViewHover
• ArcLayout
• CircleLayout
• CircularView
• CollapsingTitleLayout
• cwac-layouts
• DraggablePanel
• DragTopLayout
• DynamicBox
• ExpandableLayout
• FlatUI
• FlipViewPager.Draco
• FlowLayout
• FragmentSwitcher
• GridLayout
• ImageLayout
• InboxLayout
• KugouLayout
• LoadingEverywhere
• MaskableLayout
• Pretty
• Probe
• ResideLayout
• Scrollable
• shadow-layout
• SlidingTabs
• SpringLayout
• SuperSLiM
• SwipeBackLayout
• YieldLayout
• ZDepthShadow

Logcat

• Colored Logcat
• Lynx
• PID Cat

Lock Patterns

• Android-Lock9View
• Android-LockPattern
• android-patternview
• AppLock

Logging

• android-CLog
• android-log
• android-logger
• ArrowLogger
• automator-log-converter
• Debug
• DebugLog
• FSLogger
• Galgo
• hugo
• ILog
• jodamoblog
• logback-android
• Logger
• LogHelper
• NotificationLog
• Puree
• scrog
• SLF4J
• SLF4J Android Logger
• slf4j-timber
• Timber
• TimberLorry
• Twig

MIME

• Apache HttpMime
• Mime4j

MBaaS

• Divide.io

Mails

• BackgroundMailLibrary
• javamail-android
• kore-javamail

Maps

• AirMapView
• Android Maps Extensions
• Clusterer
• Clusterkraf
• Google Maps Android API utility library
• map-controller
• MapNavigator
• osmdroid
• Polaris
• RouteDrawer
• WhirlyGlobe-Maply

Markdown

• Bypass
• cwac-anddown
• falnatsheh/MarkdownView
• Gunio/MarkdownView

Mathematics

• MathFu

Maven Plugins

• deploygate-maven-plugin

Media

• AndroidRecording
• OpenSLMediaPlayer
• YouTubePlayerActivity

Messaging

• SmsRadar

Menus

• ActionSheetForAndroid
• Android-CircleMenu
• android-satellite-menu
• AndroidPullMenu
• AndroidResideMenu
• Button Menu
• CircularFloatingActionMenu
• Context-Menu.Android
• Droppy
• RefreshMenuItem
• Side-Menu.Android
• WearMenu

Mobile Web Frameworks

• ChocolateChip-UI
• Clank
• Fries
• iUI
• jQuery Mobile
• nativeCSS
• Ratchet

Native Image Processing

• android-image-filter
• android-lib-magick
• AndroidJniBitmapOperations
• CImg
• JavaCV
• libpng-android
• OpenCV

NoSQL

• Couchbase-Lite-Android
• MapDB
• Realm
• SimpleNoSQL
• SnappyDB

Navigation

• Flow
• FragmentMaster
• routable-android

Number Pickers

• android-numberpicker
• CircledPicker
• VNTNumberPickerPreference

Networking

• AirTube
• AllJoyn Android
• Android Asynchronous Http Client
• Apache Commons Net
• APL
• Async Http Client
• cling
• droidQuery
• Eligor
• IceNet
• Ion
• KissProxy
• koush/AndroidAsync
• KryoNet
• Network Connection Class
• OkHttp
• reyna
• RoboSpice
• RxNetty
• SyncManagerAndroid
• Volley
• Volley-OkHttp-Android
• VolleyPlus
• WearHttp

OCR Engines

• tess-two
• Tesseract

OAuth

• android-oauth-client
• Apache Oltu
• google-oauth-java-client
• oauth-signpost
• Scribe

Object Mocking

• Android Mock
• EasyMock
• Mockito
• PowerMock

OpenGL

• modern-java6-android-glframework

ORM

• ActiveAndroid
• ActiveRecord for Android
• Androrm
• Cupboard
• DBFlow
• DbQuery
• greenDAO
• MicroOrm
• Ollie
• Orman
• OrmLite
• Persistence
• RushOrm
• Shillelagh
• Sprinkles
• SquiDB New
• Sugar ORM
• Torch

PDF

• Android PDF Writer
• Android-Pdf-Viewer-Library
• android-pdfview
• MuPDF

Parallax List Views

• AKParallax-Android
• android-parallax-listview
• Android-Parallax-ListView-Item
• ListBuddies
• ParallaxEverywhere
• ParallaxScroll
• Paralloid

Password Inputs

• ActivityPassProtection
• ChromaHashView
• GridPasswordView
• PinCodePicker
• ShowEdittextPassword

Particle Systems

• Leonids

Physics Engines

• androidbox2d
• Box2D
• Bullet
• Chipmunk2D
• flixel-gdx-box2d
• JBox2D

Password Inputs

• ActivityPassProtection
• ChromaHashView
• GridPasswordView
• PinCodePicker
• ShowEdittextPassword

Parcelables

• Android AutoParcel
• dallasgutauckis/parcelabler
• Icepick
• ParcelableCodeGenerator
• ParcelablePlease
• Parcelabler
• Parceler

Platforms

• Adobe AIR
• Appcelerator (Titanium Mobile)
• Corona SDK
• Ecere
• Intel® XDK
• Ionic
• JUniversal
• PhoneGap

ProGuard

• ProGuard
• Squad leader

Properties

• android-properties

Protocol Buffer

• micro-protobuf
• platform_external_protobuf
• protobuf-j2me
• wire

Preferences

• Android-MaterialPreference
• android-preferences
• Complex Preferences
• EasyPreferences
• Hawk
• mulsellistprefcompat
• PreferenceInjector
• Prefs
• Prefser
• PrettySharedPreferences
• secure-preferences
• SharedPreferenceInspector
• SimpleSharedPreferences
• TypedPreferences
• UnifiedPreference
• WearPreferenceActivity
• WearPrefs
• WearSharedPreferences

Progress Indicators

• MaterialLoadingProgressBar
• Android Circle Progress Indicator
• Android Process Button
• Android Progress Panel
• android-circular-progress-bar
• Android-ProgressFragment
• android-square-progressbar
• AndroidProgressLayout
• BounceProgressBar
• CBCircularLoaderDialog
• CircleDisplay
• CircleProgress
• CircleView
• CircularCounter
• CircularProgressDrawable
• Dashed Circular Progress
• ExpandedCircleProgressView
• GoogleProgressBar
• HoloCircularProgressBar
• LoadIndicators
• LoadingComponentView
• Material-ish Progress
• NumberProgressBar
• ProgressMenuItem
• ProgressPieView
• ProgressWheel
• Round Corner Progress Bar
• SmoothProgressBar
• static-progress-bar
• TextCounter
• WaveView

Purchases

• Amazon in-app purchasing
• Android Beacon Library
• Android Checkout Library
• Android In-App Billing v3 Library
• AndroidBillingLibrary
• beacon-keeper
• Donations Library
• Google Play in-app billing
• Open In-App Billing
• UberVerificationSystem

Push Notifications

• Amazon Device Messaging
• androidpn
• ANE-Push-Notification
• easygcm
• java-apns
• pns

Pull To Refresh

• ActionBar-PullToRefresh
• android-PullRefreshLayout
• BounceScroller
• chrisbanes/Android-PullToRefresh
• CRefreshLayout
• GmailLikePullToRefresh
• naver/android-pull-to-refresh
• Phoenix
• PullDownListView
• PullListView
• PullToRefresh-ListView
• PullToUpdate-ListView
• RefreshableView
• SwipeRefreshLayout
• SwipyRefreshLayout
• Taurus
• Ultra Pull To Refresh

QR Codes

• android-quick-response-code
• Barcode Scanner (ZXing)
• ZXScanLib

Quick Return

• felipecsl/QuickReturn
• QuickReturnHeader

REST

• AndroidHttpRestService
• Appsly Android Rest
• Broker
• DataDroid
• Http Request
• rest2mobile
• resteasy-mobile
• Restlet Framework
• Retrofit
• Wasp
• Windigo

Radio Buttons

• android-segmented-control

Recycler Views

• Advanced RecyclerView
• DynamicRecyclerView
• RecyclerView-FlexibleDivider
• RecyclerViewFastScroller
• ScrollableItemList
• SuperRecyclerView
• Swipe_RecyclerView
• UltimateRecyclerView

Range Bars

• android-clockseekbar
• android-comboseekbar
• android-phased-seek-bar
• DiscreteSeekBar
• MaterialRangeBar
• range-bar
• range-seek-bar
• RangeSeekBar
• SeekArc
• SeekBarHint
• ValueBar
• VerticalSeekBar

RSS

• ahorn/android-rss
• Android-RSS-Reader-Library
• PkRSS
• Simple-Rss2-Android
• Simplistic RSS

Ratings

• Android Rate
• Appirater
• AppRate-for-Android
• AppRater
• Discreet App Rate
• easy-rating-dialog
• Rate-Me
• Rating Reminder
• SimpleRatingView
• StarBar

Ripple Effects

• Android Ripple Background
• Material Ripple Layout
• RippleDrawable
• RippleEffect
• RippleView

SOAP

• android-soap-enabler
• icesoap
• JSoap
• kSOAP
• nano

SVG

• androidsvg
• japgolly/svg-android
• svg-android
• svg-to-android.sh
• svg2android

Scripting

• android-scripting
• FASL
• jnlua-android

Search Inputs

• FakeSearchView
• PersistentSearch

Sensors

• AnalogStickLibrary
• DASH
• GAST
• HandWave
• Seismic
• Sensorium
• SensorManager
• StepSensor

SDK

• QCircle-Design-Template
• Tooleap

SSH

• Jaramiko
• JSch
• sshj

Scroll Views

• Android-ObservableScrollView
• BooheeScrollView
• Discrollview
• PoppyView
• QuickScroll
• ScrollBarPanelWithClock

Showcase Views

• ShowcaseView
• TutorialView

Sensors

• AnalogStickLibrary
• DASH
• GAST
• HandWave
• Seismic
• Sensorium
• SensorManager
• StepSensor

Signatures

• android-signaturepad
• ASignature

Security

• AESCrypt-Android
• Android-Password-Store
• AndroidPinning
• auth0client
• Conceal
• cwac-security
• Encryption
• IOCipher
• jmacaroons
• NetCipher (Onionkit)
• OpenPGP API library
• Spongy Castle
• SQLCipher
• Windows Azure ADAL

Sliding Panels

• AdvancedMaterialDrawer
• Android Sliding Up Panel
• android-menudrawer
• AndroidImageSlider
• BlurNavigationDrawer
• BottomSheet
• DobSliding
• GoogleNavigationDrawer
• LDrawer
• material-drawer
• MaterialDrawer
• MaterialNavigationDrawer
• Navigation Drawer
• NavigationDrawer-MaterialDesign
• sliding-pane-layout
• SlidingDrawer
• SlidingLayer
• SlidingMenu
• Slidr

Social Networks

• android-simple-facebook
• AndroidSocialNetworks
• AndroidTwitter
• ASNE
• Bitlyj
• Facebook Login Library
• Facebook SDK
• GooglePlusLoginUtil
• gravatar-android
• jReddit
• JTwitter
• Simple Social Sharing
• social-sharing-dialogs
• socialauth-android
• Socialize SDK Android
• twitt4droid
• Twitter Fabric
• Twitter4J
• uber-java

Spinners

• BetterSpinner
• MaterialSpinner

Static Analysis Tools

• Androwarn
• ApkAnalyser
• APKinspector
• Checkstyle
• error-prone
• FindBugs
• lint
• PMD
• Smali-CFGs
• Thresher

Status Bars

• PugNotification
• SystemBarTint
• Xposed-Tinted-Status-Bar

System

• Android Weak Handler
• build.prop Tools
• Libsuperuser
• Root Shell Framework
• RootTools
• superuser-commands

Styling

• Painter

TV

• gtv-resources

TDD & BDD

• assertj-android
• Cucumber
• Gwen
• JBehave
• JDave
• JUnit
• RoboSpock
• Spock
• Spock for Android
• TestNG
• Truth

Text Formatting

• Kirai
• Phrase
• TaggerString

Template Engines

• Chunk
• commontemplate
• jmustache
• MiniTemplator
• slate-templates

Testing Tools

• Bee
• Bot-Bot
• Calabash
• Remote Android Test Service
• Spoon

Text Formatting

• Kirai
• Phrase
• TaggerString

Tags

• Android TagView
• Android-Cloud-TagView-Plus
• AndroidTagGroup
• Foursquare-CollectionPicker
• TagCloudLinkView

Testing

• android-studio-testing-project-template
• Appium
• AssertJ Android
• Burst
• Fork
• Robolectric
• Robotium
• selendroid
• uiautomator

Text Watchers

• Masks

Text-to-Speech

• Android Text to Speech
• TextToSpeech

Toasts

• Android-UndoBar
• AppMsg
• Crouton
• Kennyc1012/SnackBar
• Load Toast Library New
• MessageBar
• MrEngineer13/SnackBar
• NiftyNotification
• SimpleToast
• Snackbar
• SuperToasts

Toolkits For Other PL

• Go mobile
• GoDroid
• JavaCPP
• Kotlin
• Macroid
• Neko
• Pindah
• python-for-android
• Qt
• Ruboto
• Scaloid
• Xtendroid

Tooltips

• Android Tooltip
• SuperToolTips

Text Views

• AccountAutoCompleteEditText
• Android Floating Label
• android-ago
• android-floatinglabel-widgets
• android-flowtextview
• android-fontloading-textview
• Android-RobotoTextView
• Android-SingleInputForm
• AnyTextView
• AutoCompleteBubbleText
• AutoFitTextView
• AutoFitTextView
• AwesomeText
• BabushkaText
• chips-edittext-library
• ChipsLibrary
• CreditCardEditText
• cwac-richedit
• EmailAutoCompleteTextView
• EnhancedEditText
• ExpandableTextView
• Float Labeled EditText
• Frost
• HtmlTextView
• Justified
• KeyboardlessEditText
• Makeup
• MaterialEditText
• MultiActionTextView
• PatternedEditText
• richeditor-android
• RiseNumber
• SecretTextView
• Shimmer-android
• SocialTokenAutoComplete
• TextChronometer
• TextJustify-Android
• TextViewWithLinks
• TimelyTextView
• Titanic for Android
• TitledEditText
• TokenAutoComplete
• WaitingDots

Tools

• alfi
• aminc
• Android Device Inventory
• Android Devices
• Android Resource Navigator
• Android Studio Templates
• android-resource-remover
• android-unused-resources
• AndroidAssetStudio
• AnUitor
• Apktool
• battery-historian
• detective-droid
• Device Frame Generator
• dspec
• gitignore.io
• GridWichterle
• ios2android
• j2objc
• JitPack.io
• Madge
• Raccoon
• Scalpel
• shadow4android
• Stetho
• ViewPortSizes
• ViewServer

USB

• Android ADK Toolkit
• libusb
• PhysicaloidLibrary
• USB MIDI Driver
• usb-serial-for-android

Updaters

• android-autoupdater
• Fit
• UpdateChecker

Utils

• Adroit
• Amalgam
• Android Transformer
• android-common-lib
• AndroidBucket
• AndroidDynamicLoader
• AndroidQuickUtils
• AndroidUtils
• Apache Commons Codec
• Apache Commons IO
• AQuery
• AXT
• Caffeine
• CommonSDK
• date4j
• Droid-Fu
• ExceptionWear
• greenrobot-common
• Guava
• Holdr
• Joda Time
• joda-time-android
• jraf-android-util
• KissTools
• NoTils
• Okio
• Reflection No Reflection
• Sprockets
• xUtils

Video

• android-ffmpeg
• AndroidFFmpeg
• AndroidYoutubeOverlay
• FFMPEG Library for Android
• FFmpeg-Android
• FFmpeg-Android-Java
• ijkplayer
• libstreaming
• mp4parser
• TextureVideoView
• video-crop
• YouTube Android Player

Validation

• Android Saripaar
• android-edittext-validator
• android-formidable-validation
• Android-Validator
• AwesomeValidation
• FloatingLabelValidator
• FormValidations
• HouseOfCards
• ValidationKomensky

View Adapters

• Adapter Kit
• Android Filtering List
• android-parallax-recyclerview
• AnnotatedAdapter
• base-adapter-helper
• cwac-adapter
• cwac-endless
• cwac-merge
• cwac-pager
• cwac-sacklist
• cwac-strictmodeex
• DragSortAdapter
• EasyAdapter
• EasyListViewAdapters
• EasyRecyclerAdapters
• Efficient Adapter for Android
• FunDapter
• GridListViewAdapters
• MultiChoiceAdapter
• MultipleViewTypesAdapter
• Parchment
• PinterestLikeAdapterView
• RecyclerRenderers
• RecyclerViewRenderers
• Renderers
• SectionCursorAdapter
• Simple Section Adapter
• twoway-view
• WonderAdapter

View Pagers

• android-auto-scroll-view-pager
• Android-ParallaxHeaderViewPager
• astuetz/PagerSlidingTabStrip
• AutoNotifyViewPager
• BackgroundViewPager
• CircleIndicator
• CircularBarPager
• FontPagerTitleStrip
• freepager
• Infinite View Pager
• JazzyViewPager
• jpardogo/PagerSlidingTabStrip
• LinkedViewPager
• LoopingViewPager
• MaterialTabs
• MultiViewPager
• OViewPager
• PagerSlidingTitleIconTabStrip
• ParallaxPager
• ParallaxPagerTransformer
• ParallaxViewPager
• PullToDismissPager
• RatioViewPager
• RecyclerViewPager
• SmartTabLayout
• SpinningTabStrip
• SpringIndicator
• TabBarView
• VerticalViewPager
• View Flow
• ViewPagerIndicator
• ViewPagerTransforms

Views

• Android Drawable View
• AndroidTreeView
• AndroidUIView
• ContextualView
• CurtainView
• DraggableFlagView
• ErrorView
• ForegroundViews
• GameOfLifeView
• HorizontalPicker
• json2view
• MatchView
• Material Shadow 9-Patch
• MultiStateView
• Plaxien
• RoundedLetterView
• TextDrawable
• TileView
• view-holder-generator

Watch Face

• Clockwise

Wearable Data Layer

• BusWear
• Courier
• OkWear
• Teleport

Wheel Widgets

• android-spinnerwheel
• Android-Wheel-Menu
• AndroidWheel
• wangjiegulu/WheelView
• WheelView

WebSockets

• AutobahnAndroid
• codebutler/android-websockets
• koush/android-websockets
• Tyrus

Weather

• Android-wunderground-client
• ForecastIO-Lib-Java
• owm-japis
• WeatherLib
• YWeatherGetter4a

Wi-Fi

• android-wifi-connecter
• NetworkEvents

Wizards

• Android Wizard
• AWizard
• WizardPager

XMPP

• flowdalic/asmack
• jaxmpp2

XML

• JDOM
• kXML
• Simple
• simple-easy-xml-parser
• VTD-XML
• Woodstox
• XML Data Parser
• XStream

YAML

• JYaml
• SnakeYAML
• YamlBeans