Browser_Based

See also:

Bots - A text based fighting simulator taking on the roll of a Robot.
KillStreet.com - Free Text based fighting simulator under the roll of a modern thug.
Kung Fu Madness - Kung Fu fighting game. Challenge other players in battle and team up with others by joining a dojo.
Prison Struggle - Free text based game where users take on the roll of a prison inmate.
RetroUrban - Flash based fighting game.
TheNinja-RPG.com - Browser based fighting simulator taking on the roll of a Ninja.
The Wrestling Game - Roleplaying-based on fighting and career management, titles, tournaments, rosters, and federations. [Registration required.]
Xenyoo - Player creates a character which you train and make stronger to fight against other players.