Darts is an Android and Windows App for one of my hobbies.
It started as my first step into Android development am few years ago. But I keep maintaining it to stay up to date in this area.
Darts contains support for these games:
301 and 501 for up to 4 players
Elimination, a Sorry! game, for up to 8 players. This is the best game for your party!
Training mode to improve the precision of your throws
Statistics for games and training
It is available for free for Windows and Android