Alizarin Tetris
Tetris-like game with network support and AI opponents for Unix, Windows, or BeOS.
BedTer
Tetris clone with customizable graphics and sound. Available for Windows 9x/NT (requires DirectX) or Linux.
Black Hole
Tetris for Linux or Windows set in space with blocks coming from four different directions.
Block Master
Tetris-like game for Windows 95/98/Me/NT/2000/XP with sound, and options to set width and height, use "magic" blocks which appear or disappear, or include a crawling insect.
CR Tetris
Twenty-two levels of Tetris for Windows with themes, music, and sound effects.
Crack Attack
OpenGL Linux version of Tetris Attack in which you can eliminate blocks horizontally or vertically. (Open Source, GPL)
Eittris
Tetris knockoff for Windows offering multi-person competitive play with up to four players and high scores on the web.
Extended Tris
Tetris clone for Windows in which the winner makes the most tris, counting as a double tris 4 as signs on the same line.
GLBlocks
Multicolor square blocks are falling; lines disappear when four segments of the same color touch. For Windows, and a port to Game Park's GP32 handheld gaming console.
Horses Tetris
A Tetris clone for Windows with pictures of horses in the background. Other clones available, including some with holiday themes.
NetTetris
Tetris for Windows designed and optimized for two player network duels.
Nonsense Software
Home of Cowtris, a Tetris clone using cartoon images of cows. For Windows 95 or later. Features music and cow sounds, two-player mode.
Owen's glTetris
Open source version for Windows made with SDL and OpenGL.
Stacker Blocks 3D
A falling blocks game for Windows in the style of classic Tetris. However, unlike classic Tetris, Stacker Blocks uses Direct3D graphics to give the game added visual appeal. (Open Source, GPL)
Super ACiD Block Attack
Use falling blocks to fill in up to five horizontal rows. With music. For DOS or Windows.
Tetanus On Drugs
Simulates a game of Tetris under the influence of hallucinogens for DOS, Linux, or Windows. (Open source, GPL)
Tetris
Windows version with sound, and the ability to minimize to the system tray.
Tetron
Multiplayer Tetris for Windows for up to eight players. Features internet play, customizable skins and sound themes.
U61
Multiplayer network falling block based game for Windows or Linux. (Open Source, GPL)
Wiz Tris
Columns-style game with customizable graphics and sound, for Windows.