NullpoMino - NullpoMino is an open-source action puzzle game that works on the Java platform.
Tetris Blitz - Race against the clock in a two-minute blitz to clear lines and rack up points before time runs out.
OpenBlok - A customizable, cross platform, open-source falling block game, packed with a bunch of features.
Blockinger - An open source Tetris clone for Android.
Puyo Puyo Champions - Fun, fast-paced, competitive puzzle action!
1010! Klooni - 1010! Klooni is the FLOSS version of the original minimalistic puzzle game by Gram Games.