World at War
- Play this turn-based game with 22 maps, including Risk's classic map.
- http://www.wawgame.com/

Conquer Club
- Free multiplayer variation of the board game. Offers player rankings, alternative maps, individual and team games, and a community.
- http://www.conquerclub.com

LandGrab
- Web-based strategy game with many extra features such as custom maps, teams, leaders and fortresses.
- http://landgrab.net/

Warfish
- An online, by invitation only Risk based game which uses a dynamically created image for board display.
- http://www.warfish.net/

Dominate
- Offers moderated gameplay, a ranking system, game documentation, and a discussion forum. [Membership required for some features.]
- http://www.dominategame.com/

Global Combat
- A variant where turns are taken simultaneously. Offers a player manual, rankings, and online gameplay.
- http://www.globalcombat.com/

CleverMedia: World Conquest
- A Shockwave version of a classic strategy game.
- http://clevermedia.com/game.cgi?worldconquest