1983 Richard Stallman announces the GNU project to develop a free Unix-like operating system.
1990 Microsoft releases the Windows 3.0 operating system.
1992 386BSD is released by Lynne Jolitz and William Jolitz beginning the Open Source Operating System Revolution. Linus Torvalds release his Linux soon afterwards.
1993 The Slackware operating system is first released.
1995 Computer software developer Microsoft releases its Windows 95 operating system.