List of free and open-source Android applications

http://en.wikipedia.org/wiki/List_of_free_and_open-source_Android_applications
http://www.insurgentgames.com/
http://www.aopensource.com/
https://github.com/playgameservices/android-samples
https://github.com/ruscoe/Android-Tile-Based-Game
http://stackoverflow.com/questions/6410107/open-source-for-android-game-development
http://www.techdrivein.com/2010/12/15-nice-and-simple-open-source-android.html
https://code.google.com/p/cloak/
http://mobilegameengines.com/android/open_source_game_engines
http://mobilegameengines.com/android/game_engines
http://forum.xda-developers.com/showthread.php?t=2124002
http://androiddeveloperspot.blogspot.com/2013/05/android-game-free-open-source-code.html
http://sourceforge.net/directory/games/card-games/language:java/os:android/freshness:recently-updated/
http://gamedev.stackexchange.com/questions/5515/any-open-source-game-engines-for-android
http://forum.freegamedev.net/viewtopic.php?f=20&t=3411
https://code.google.com/p/opensudoku-android/
https://code.google.com/p/tictactoe4android/