Political Space Warfare

Political Space Warfare is an ambitious, multi faceted space based strategy in-progress game. Still far from achieving it's full vision, PSW wants to offer gameplay ranging from long-term strategy gameplay as seen in browser based empire building games such as Travian all the way down to a RPG where you play as a single unit in the greater picture.

Unfortunately, its Windows only at the moment, but the team are planning to port it to Linux/other platforms as soon as possible, which will be a lot sooner if there are any of you willing to help :)

PARPG

In a quick aside, PARPG is looking for a Lead Writer/ So if any of you are in the mood for writing some Post Apocaliptic fiction, be sure to have a look

Wagic

Yes I have to admit... I spend waaay too much money back in the nineties on that crazy trading card game MTG ;) But hey, I am a changed man now and I beat that addiction ;)
So I don't think I should actually touch the game I am about to present to you with anything but a 10 ft pole, but well... it is probably a damn fun game ;)

Anyways...Wagic is obviously an only half-heartily hidden Magic the Gathering implementation on your favorite gaming device (including the neat Linux driven N900, which is actually a FOSS dream compared to all those Android smart phones... no, I am not getting paid for mentioning it ;) ). And with that we have already the main problem with Wagic... it's data and media can obviously not be really free, even if they don't actually use any copyrighted pictures from that game as far as I can tell.

But the rest of that game looks actually really nice, and with the source under the BSD you can't make much wrong, right?

Wagic gameplay

But maybe the engine could be combined with the really FOSS Wtactics card game? (Edit: yay, they seem to consider doing so in the future; see comments!)

Simple & Polished

 Avoision

 Falling Block Game 2

Avoision is a simple collect-dots-avoid-blocks game.

Falling Block Game 2 is a Tetris clone.

Both are simple games. Both are very polished! I avoided them at first, assuming they would be of the yet-another-hello-world-game type but luckily got over that arrogant moment. :)

Neither forces full-screen, they scale to any resolution, controls are crystal clear and feedback is great.

Both games use Radius Engine, which is a Win/Lin OpenGL/SDL/Lua engine. Kind of like LÖVE.

For Arch Linux users: I made AUR packages for Radius Engine, Avoision and FBG2. I use clyde for managing packages.

PS: Sometimes polish is worth more than complexity. Can you name free open source games that are polished to the max?