JTed  
   A Columns clone. Includes top 30 highscores, licensing rules for webmasters, statistics and game which includes 2 lives, sound and the option to change speed.
   http://www.jted.com/

Hextris  
   Rotate and place hexagonal pieces on the board in this online version of Tetris in Java.
   http://www.hextris.com/

Netris  
   Play Tetris online.
   http://www.emeline.com/tetris

Javascript Tetris  
   Has piece preview, 13 levels and background music.
   http://www.dansteinman.com/dynduo/demos/tetris/

Fibris  
   Online Tetris championship game in which companies compete against each other for high score. Players may add their company or play alone. Requires Shockwave.
   http://fibreplay.com/fibris/

Multris  
   Realtime multiplayer game that you can play directly in your web-browser, no plug-ins needed. (Java)
   http://www.multris.com

Tetris Love  
   Tetris game reviews, history and links to 10 Tetris web games.
   http://members.fortunecity.com/tetrislove/

Online Tetris  
   Free online Java Tetris game.
   http://hem.passagen.se/mnomn/tetrissida.html

Swoj.com Tetris  
   Online version of Tetris puzzle game including high score tables.
   http://www.swoj.com/tetris/

Setup Group Tetris  
   Java version of Tetris game available for play online. Includes top ten high scores.
   http://www.setupgroup.com/tetris.php

Java Tetris  
   Online Tetris game with piece preview and ten different speeds. Java source code is freely available.
   http://www.percederberg.net/home/java/tetris/tetris.html

Tetris 2019  
   Arcade-style Tetris clone. Includes highscore list.
   http://gjk.dk/~v3308a/tetris/

Tetris  
   Java applet game offering level and score.
   http://www.cmpe.boun.edu.tr/~kocaman/tetris/tetris.html

JS Tetris  
   Javascript game includes choice of start level and Hall of Fame.
   http://www.idep-multimedia.com/tetris/tetris.php