virtual appliances for vmware

• http://www.applianceforge.com/
  
• http://www.vmware.com/appliances/
  
• http://www.vmware.com/appliances/directory/cat/506
• http://linhost.info/vmware/
• http://www.vyatta.com/
• http://kneew.com/node/32

how to create the perfect centos server

http://www.howtoforge.com/perfect-server-centos-5.3-x86_64-ispconfig-2

Free security software

http://en.wikipedia.org/wiki/Category:Free_security_software

Go kart

Πίστες κάρτ στην Ελλάδα
http://www.kartland.gr/
http://www.breathtakingathens.com/node/4387
http://www.kartmania.gr/

Linux Backup tools

• Rsync
• lucky backup

forum 1, 2
genikotera gia backup (1, 2,3, 4, 5, 6, 7, 8)

Linux usefull commands

1. http://www.pixelbeat.org/cmdline.html
2. http://www.ss64.com/bash/
3. http://www.oreillynet.com/linux/cmd/