The grand list of Freeware and Online games.

[Colson]

Aww, crap. Cave Story and Quake Live have already been listed. :<

 

[Ezer'Arch]

Warsow. A fast-paced [*platforming] shooter based on the Quake 2 engine. Most servers are UK/German, but you'll have no lag if you live in the US due to anti lag. Avoid people who believe instantly high pingers lag more, however, as that is usually not true here. http://www.warsow.net

After 7 years in beta, Warsow 1.0 is out: http://www.warsow.net/forum/thread/14994

(more screens of me playing Warsow 0.7, I'm still downloading the update ;D )

EDIT: this topic could be merged with http://mb.srb2.org/showthread.php?t=36664.

* Edit by Ezer'Arch

 

[Kitoko]

This will probably be stupid and get me burnt to the stake, but..

SRB2 - Oh yes this can be in the list. We're all posting about free/online games when we are in a forum about a game that IS that. Get the awesome game at http://www.srb2.org :)

 

[ABraker95]

I Wanna Be The Boshy
http://solgryn.org/game.php?title=IWBTB

It is THE hardest game you can find on the internet. This game was made as a clone to "I Wanna Be The Guy" and supersedes the difficulty that game has to offer. If you really want a challenging game, my bet is that you are not ready for this one!
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[Bbop800]

That's funny, I was just playing that earlier.

And yes, I Wanna Be The Boshy is a great IWBTG fan game, and I daresay is bests the original game by millions. It even has online play!