Tetris on a plane - Simple, open-source HTML/JS/CSS version of Tetris built as an exercise.
Good Old Tetris - Play Tetris Online. The game that will never get old.
Blockinger - An open source Tetris clone for Android.
Tetris Online Poland - Tetris Online Poland (TOP) is an online tetris game where you can play tetris with your friends and tetris experts from all over the world.
Tetris Blitz - Race against the clock in a two-minute blitz to clear lines and rack up points before time runs out.
Word Tetris - Tetris with words