Tetris on a plane - Simple, open-source HTML/JS/CSS version of Tetris built as an exercise.
Tetris.com - Tetris Friends is an Online, Puzzle, Single and Multiplayer video game created by Tetris Online, Inc.
Blockinger - An open source Tetris clone for Android.
Cultris II - Cultris II is a Puzzle, Single and Multiplayer video game with Split Screen element.
Tetris Blitz - Race against the clock in a two-minute blitz to clear lines and rack up points before time runs out.
Not Tetris 2 - Not Tetris 2 is an Addictive Physics-based puzzle video game that offers a new style of Tetris experience in which block is no longer bound to the usual grid.