Quite possibly one of the largest EV sites out there, EVula's Lair has a large number of links to EV pages, is home to the semi-famous EV Directory (the largest/only directory of people in the EV community), the EV/EVO/EVN Survival Guide, a large online Shipyard, and a lot of info on other games, as well as Quote and Joke Archives. As for EVula himself, he can write entire ego-boosting phrases that describe his website in a single sentence. :)
Entertainment, Games, Video Games, Action, Space Combat - Timo K Suoranta's glElite. News, background information, documentation and screenshots from a project to create a space-roleplaying framework, based around the Teddy graphics engine.
SourceForge presents the Tunnel Fighter project. Tunnel Fighter is an open source application. SourceForge provides the world's largest selection of Open Source Software. The tunnel fighter game is made using CrystalSpace. The game is about freeing the hyperspace tunnels of an alien menace. It should work on any platform CS supports. You can play from a 1st or 3rd person perspective.
Epiar is an open source space arcade, action, adventure, trading game written in C and licensed under the GNU GPL. It is similar to Solar Winds or Escape Velocity. It is playable under Linux, Windows, Mac OS X, and FreeBSD, and may well be ported to other platforms.