- UNIX: 1969 Thompson & Ritchie AT&T Bell Labs
- BSD: 1978 Berkeley Software Distribution
- Commercial Vendors: Sun, HP, IBM, SGI, DEC
- GNU: 1984 Richard Stallman, FSF
- POSIX: 1986 IEEE Portable Operating System unIX
- Minix: 1987 Andy Tannenbaum
- SVR4: 1989 AT&T and Sun
- Linux: 1991 Linus Torvalds Intel 386 (i386)
- Open Source: GPL, LGPL, Cathedral and the Bazaar
GNU project
Established in 1984 by Richard Stallman, who believes that software should be free from restrictions against copying or modification in order to make better and efficient computer programs
GNU is a recursive acronym for “GNU's Not Unix”
Aim at developing a complete Unix-like operating system which is free for copying and modification
Companies make their money by maintaining and distributing the software, e.g. optimally packaging the software with different tools (Redhat, Slackware, Mandrake, SuSE, etc)
Stallman built the first free GNU C Compiler in 1991. But still, an OS was yet to be developed
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