Linux Open Source Projects
To the best of my knowledge these are all free open source solutions! Note: Not all of them may be free to businesses!
Apache - http serverAwstats - http server statistics
CentOS Operating System
DansGuardian - web content filtering
ClamAV - anti-virus toolkit for e-mail scanning
FWNUA (Free Windows Network User Accounting)
GLPI - Free IT and Asset Management Software
Maia Mailguard - Spam and Virus Management System
MRTG - Router Traffic Grapher
Nagios Network Monitoring
net2ftp - A web based FTP client
OCS Inventory NG - Hardware/Software Inventory
openSUSE Operating System
OpenSSL - http SSL security
Postfix - e-mail system
ProFTPD - FTP Server
SpamAssassin - e-mail spam filter
Squid Proxy Server
Squint - Squid reporting tool
