The ClanLib Game SDK - A cross development platform for developing games for Linux and/or Windows. News, about, features, download, documentation, FAQ, mailing list, IRC information, and links.
The Game Programming Toolchest (GTC) - Pre-alpha library of various things useful for games. Code put under the GNU LGPL. Downloads, screenshots and links on site.
The Linux Game Programming Webring - Collection of sites concerned with Linux Game Programming. You can also find links to games from these sites.
Steve's Portable Game Library Page - Set of OpenSource (LGPL) libraries for writing games and other realtime interactive applications that are 100% portable.
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