Unknown Worlds announces the release of the source code for Natural Selection, their original Half-Life modification that paved the way for their standalone Natural Selection 2. They say: "You can use the NS source code to make your own version of the original game, fix problems with it, make new problems, or just see how the game worked." However, they somewhat vaguely warn: "Today, we are proud to announce that Natural Selection Source Code is now available to anyone, free of charge. Head on over to GitHub to get it.. It’s not ‘open source’ – There is some legal hoo-ha that prevents that. But it is all there." Thanks Ant.