www.bacula.org Bacula Backup Software

www.freebsd.org FreeBSD Unix

www.typo3.com Typo3 CMS

www.dbmail.org Stores Mail in a database & access via IMAP or POP

http://www.pfsense.org/ Nice Firewall appliance (see also monowall)

norloff.org/ntp/ NTP Time Server/Client for Windows NT/2k/XP (Free)