I asked: > what open-source operating systems exist today? > > By "operating system" I mean something that provides at the very least > preemptive multitasking, and by "exist" I mean either fully functional > or working to a reasonable extent and being actively developed.
There were a few additions suggested to the four I mentioned, so here's the updated list: - Hurd - Linux - various BSD derivatives - VSTa (http://www.zendo.com/vsta/) version 1.6.2 is expected soon - Squeak (http://squeak.cs.uiuc.edu/): a Smalltalk that can run on bare hardware - Sprite (ftp://ftp.cs.berkeley.edu/ucb/sprite/sprite.html): no longer being developed - Caldera's DR-DOS In addition to http://www.cs.arizona.edu/people/bridges/os/free.html there's also a list at http://camars.kaist.ac.kr/~lhg/os.html#FREEOS My conclusion: there are surprisingly few free operating systems. Edmund
