Firstly a quick mention about the progress of VDrift development. It continues at an impressive pace. To improve performance, amongst other things, they have been implementing their own scenegraph and refactoring the drawing code. Also implemented in this branch are shader-based effects (bloom & motion blur) and it looks sumptuous. All it needs is a few really nice tracks and the commercial racing games will be getting a run for their money from VDrift. Honestly, I played Ridge Racer 7 on the PS3 the other day and I was underwhelmed.
Given the ubiquity of cars, the general appeal of racing games, and the ability for lots of people to contribute content easily, I would go as far as saying that for once the open source model is potentially better than a commercial approach for developing this kind of game. I can't think of any other genre for which that might be true.
Anyway, there's a few loose ends to tidy up. Many thanks to the commenters who contributed the following valuable pieces of information... (and I promise to eventually go back and correct the posts.)
RG Pro Hockey does still exist online, as a Sourceforge project. And there has been commits since the last release, although development is currently inactive. Still, it means it's not lost, and thanks anyway to the other comment pointing to an alternative download site. Anyway, project page for the game is here:
http://sourceforge.net/projects/rg-pro-hockey
Sonic Robo Blast 2 is actually cross-platform. Very cross-platform. It turns out the game code is based on the open source Doom engine Doom Legacy. It even has been ported to the Dreamcast. However I think the SRB2 team needs to rethink it's distribution policy - they only link to a .exe which is a self-extracting archive. I had little luck finding information on any Linux binaries of the game, although admittedly I did not look too hard. I think there's some here (lsdlsrb2 or lsdlsrb2beta) but I have not properly investigated.
I typo'd the Street Rod 3 game name and website. Although development seems dead, apologies to the developers and thanks to the reader who did what I should have done; verified the link. The actual site is here:
And finally for today there's a relatively new site where you can find several open source multiplayer games being hosted, called Network Games. It's a nice idea to promote a community around playing a few of the better free games around.