Ltris is described as 'LTris as a tetris clone: differently shaped blocks are falling down the rectangular playing field and can be moved sideways or rotated by 90 degree units with the aim of building lines without gaps which then disappear (causing any block above the deleted line to fall down)'. There are more than 25 alternatives to Ltris for a variety of platforms, including Android, Windows, Linux, Online / Web-based and iPhone. The best alternative is Puyo Puyo Champions. It's not free, so if you're looking for a free alternative, you could try NullpoMino or Quadrapassel. Other great apps like Ltris are Blockinger (Free, Open Source), Tetris Blitz (Freemium), Cuyo (Free, Open Source) and Tetris on a plane (Free, Open Source).
In Quadrapassel, the GNOME version of Tetris, your goal is to create as many complete horizontal lines as possible. The lines are made from seven different shapes. The shapes fall randomly from the top center of the screen.
Cuyo is a Tetris-style puzzle game for up to two players. The player controls falling blocks of various types which change with each level. For example, in the first level, the player has to connect differently colored cartoon faces to each other.
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. You can also challenge your own records or train yourself against a bot.
1010! Klooni is a free, libre and open source klooni of the original minimalistic puzzle game by Gram Games. Fill Up the Board: Drag the pieces on the board and try to clear as many strips as you can! Beware though, it is not that easy o:)