Good Old Tetris - Play Tetris Online. The game that will never get old.
NullpoMino - NullpoMino is an open-source action puzzle game that works on the Java platform.
Word Tetris - Tetris with words
Tetrust - Open-source, terminal-based Tetris game made with Rust.
Tetris Blitz - Race against the clock in a two-minute blitz to clear lines and rack up points before time runs out.
Blockinger - An open source Tetris clone for Android.