The year is 1999. Two shooters are competing for the crown of the ultimate shooter. Their names: Unreal Tournament and Quake III Arena. I have to admit that I fell in love with Unreal Tournament and did not play Quake III Arena that much which was still a good game but not that good, hehe.
The game for this weekend is called Open Arena which is a Open Source version of Quake III Arena released just a few weeks ago in a new version. The game does not try to rebuild every inch and corner of Quake III but is still a pretty solid remake of the original game with technical advancements such as higher texture resolution and polygons in the character models.
You can play single player against bots or multiplayer against human opponents. Various game modes such as Capture The Flag or Death Match can be selected. The game is fast, has some servers with good pings available and is in my opinion one of the better games that are available freely on the web.
The size is reasonable with about 160 Megabytes. There is no installation involved, just unpack and run it. Try it out, it is really a great game.
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Another free game which work on this Open Source engine and that I find also great is Urban Terror:
http://www.urbanterror.net
http://en.wikipedia.org/wiki/Urban_Terror#Maps
Really great game.
Wakoopa tracker (http://wakoopa.com/roman_sharp – my profile) shows, that I spend on it to this moment 9 hours, 6 minutes and 43 seconds.