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Linux

• Written by Linus Torvaldis...
  used and improved by thousands
• Copyleft source code
• Full UNIX, mostly POSIX
• XFree86, C, C++, Fortran, Pascal, etc.
• Supports "IBM compatible" PCs, DEC Alphas, Sun SPARCs, PowerPCs, etc.
• Linux Documentation Project
  http://sunsite.unc.edu/mdw/linux.html