BSD

• OpenBSD Ports
• FreeBSD FreshPorts
• BSDNow TV
• Daemon Forums
• LiveUSB with OpenBSD- Bootable OpenBSD flashdrive for your keyring
• FOSDEM is a free event that offers open source communities a place to meet, share ideas and collaborate.
• BSD versus Linux
• C programming tutorial
• C Boot Camp
• The BSD Certification Group
• Warren Block hints for setting up FreeBSD
• Basic C Programs
• C programming Solved Programs/Examples with Solutions
• The GNU C Library
• OpenBSD and other stuff from Keith Burnett
• The C Programming Language, 2nd Edition, by Kernighan and Ritchie, answers.
• Scientific Linux - can run directly as LiveUSB.
• Minix 3 Microkernel OS