How about Nitrome?

Try orcpad.com for flash games and if you like the offline (or non flash) shooter games i would suggest world of padman :)

Its a multi platform shooter game and works on linux and windows, there are tons of good free games just perhaps you are unable to find them, also total annihilation for unix works great as well...

World of Padman is one of the best games that i've played and that are open source and standalone...

As for flash games you can easily find some on orcpad or other flash websites but i prefer the ease of search on orcpad...

Also if you like other free games just check the linux groups, there are lots of good games and they might have a port for windows as well :)

Hope you will enjoy your games ;)

Quote: Original post by Keido
Also if you like other free games just check the linux groups, there are lots of good games and they might have a port for windows as well :)

Happy Penguin. Lots of open source games, most of which have Windows and even Mac OS ports.

runescape i think has been said but runes of magic is a HUGE free to play mmorpg

Cross fire is a free FPS similar to Counter-Strike (you can pay for weapons and other things like that, but it's fun without doing so and buying weapons no substitute for being good at the game)

There's also about a million Geometry Wars clones that are probably quite fun.

What, exactly, constitutes a "free" game?
I hardly think commercially developed ad-supported games, such as Quake Live or many flash game portals, or abandonware released for general goodwill ought to count in this context. If nothing else I doubt many US tax-payers would consider America's Army to be a free game.
In other words I'd argue that what we're interested in here is whether the developers got paid, not whether the users have to pay (directly) for the product.

Not that there's any lack of games which would be considered free under any reasonable definition, it's just that the development model used most large open-source software projects doesn't seem to be a very good fit for producing game content.

I've had an extraordinary amount of time sucked into Evony (www.evony.com) recently. Kind of slow since resource gathering is pretty much real time, but it's actually a lot more sophisticated than it first appears. But don't expect to see the boobs from the ad - you never get a closer view than if you were in an airplane overhead.

http://www.targetdefense.com is one of the best free Tower Defense games.