The Free Peer-Peer Security Software PeerGuardian is an open source IP address blocker and a Free P2P Virus Protection software, that can prevent access to thousands of sites. It uses multiple, categorized lists and you can choose which type of sites you want to block, including spyware and malware related, advertising related and P2P file sharing [...]

 POPFile is a powerful, cross platform email classification POP and NNTP proxy, that you can use to filter spam efficiently and categorize good mail automatically. You can Automatically Sort Web Emails with Free POPFile.   

Bacula is a highly flexible, open source, cross platform Free Backup Manager. The Free Backup Software is basically an UNIX based set of programs, aimed at system administrators to manage network backup & data recovery, and verification of computer data across a network.

 DocSearcher is a  Powerful Computer Search Software that uses the Open Source Lucene and POI Apache APIs as well as the Open Source PDF Box API, to provide searching capabilities for HTML pages, MS Word, MS Excel, RTF, Open Office (and Star Office) and also PDF files on the computer.

The Free Multi Platform Archive Software PeaZip is an open source file and archive manager that is cross platform, and is available as a portable or installable software for both 32 and 64 bit versions of the Windows operating system.