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Oberin

"Oberin is an online fantasy role-playing game and virtual community, available exclusively for Macintosh. Oberin takes place in a persistent, ever evolving world -- your character may come and go, but the world continuously runs."

Free to play indefinitely.

http://www.oberin.com/

Online Boxing

"Welcome to Online Boxing, the first Multiplayer Internet based Boxing Game."

Free to play indefinitely.

http://www.onlineboxing.net/

Outgun

"OUTGUN is a simple 2D Capture The Flag (CTF) game. Up to 32 players can play via internet."

Free to play indefinitely.

http://outgun.sourceforge.net/en/