2. BSD : Berkeley Software Distribution.
3. Caldera : The Caldera Open UNIX 8 deployment platform uses Linux Kernel Personality (LKP)
4. FreeBSD : FreeBSD makes a great internet server Or firewall, and recent advancements make freeBSD powerful multimedia editing workstation.
5. HP-UX : HP-UX was the first Unix to use access control lists for file access permissions.
6. Solaris : Solaris is the unix flavor produced by sun Microsystems.
7. Linux : Linux has generated more excitement in the computer field than any other development.
Linux flavors : Red-hat, Fedora, SUSE, Slackware, Gentoo, Debian, mandrake.