Android 3rd-party libraries

Utility

• Droid-fu
• android-screenshot-library
• android-alarm-database
• OpenIntents
• ACRA
• AndroidAnnotations
• AndroidAsync

Persistance

• Simple XML Serialization Library (with Android Instructions)
• GSON JSON Serialization Library (with Android Instructions)
• SQLite ORM called ormlite (with Android Instrutctions)

Network

• Ganymed SSH2
• oauth-signpost

Barcode/QR-Code/Image Processing

• ZXing
• jjil (Image Processing)
• OpenASURF (Image Processing)

Contacts/Social Network

• AndroidLibs
• Jackcess (MS Access) (small Android FIX)
• Twitter4J
• Facebook Android SDK

UI stuff

• android-wheel
• GreenDroid
• android-actionbar

Mixed/Allround

• CWAC (CommonsWare Android Components)
• libs-for-android
• android-misc-widgets

Maps

• android-mapviewballoons
• osmdroid
• mapsforge

Game Engines/3D stuff

• libgdx
• forget3d
• min3d
• rokon
• Angle
• AndEngine
• jMonkeyEngine

Image Processing and Graphics

• OpenCV for Android

Translation

• Google Translate API - Java (Not specific for Android, but works)

Testing

• Borachio (Android Instructions)

TTS / STT

• Eyes Free (A TTS Library)

Other Lists

• OpenIntents List of Useful Libraries

Others

http://commonsware.com/cwac