My all-time favorite is d2x-xl, a re-work of the Descent II engine (which isn't quite a clone, because you still need some of the original game files to play):

My all-time favorite is d2x-xl, a re-work of the Descent II engine (which isn't quite a clone, because you still need some of the original game files to play): http://www.descent2.de/ http://www.descent2.de/ Stratagus/Wargus is a clone of the Warcraft II engine (which you also need original game files to play). It's no longer being actively developed, but the last release was stable and only had minor bugs (you can play all of the way through with no problem, plus multiplayer): http://wargus.sourceforge.net/index.shtml http://wargus.sourceforge.net/index.shtml There's also a glacially-slow effort to re-work the Homeworld source code to openGL (and cross-platform): http://homesource.nekomimicon.net/sourceforum/ http://homesource.nekomimicon.net/sourceforum/