Top 10 Open Source Security Software
azhar 
Open Source 
free anti-spyware, free anti-virus, free security software, Open Source, open source securityOpen source has became the world’s largest community to offer a large number of software’s to perform daily tasks. Let me share a list of ten most downloaded security applications from open source community;
Anti-Virus / Anti-Malware
A very handy windows application that uses popular anti-virus engine ClamAV to detect viruses and spywares. It includes a scanning scheduler, automatic downloads, and a Microsoft Outlook plug-in. However, it does not provide real-time scanning; you’ll need to scan your files manually in order to be protected.
2. ClamAV
Most of the commercial and open-source products are based on the Clam Antivirus engine because of its light weight and efficient behavior. It is designed for protecting e-mail gateways, ClamAV offers automatic updates, a command line scanner, and many more. List of compatible operating systems is Unix, Linux and BSD.
Reference to the name of the anti-virus tool, Rootkit Hunter searches your system for rootkits and other unwanted tools that can make you feel uneasy to use your system. It does not provide live or scheduled scanning, but the Web site contains instructions for setting up your system to run Rootkit Hunter daily. List of compatible operating systems is Linux and Unix.
4. ClamMail
IT combines a POP3 e-mail proxy with the ClamAV engine to get the ultimate result to protect your e-mail system from all types of viruses and malwares. The result is free antivirus protection for messages accessed via Outlook, Thunderbird, Eudora, or other POP3 apps. Compatible operating systems is Windows.
5. Viralator
An excellent supplement of your anti-virus. If you have an anti-virus but you Still getting the occasional network virus. Viralator supplements the existing anti-virus software on your proxy server to block malware that might otherwise slip in when users access free webmail accounts. Compatible operating systems are Linux and Unix.
This is a very handy and easy anti-virus that can Secure everything. It is currently based on ClamAV, but the developers are working on an antivirus engine of their own that will enable real-time scanning.
7. AMaVis
This is Short for A Mail Virus Scanner. It acts as a go between for your anti-virus software and your mail transport agent so that incoming e-mails can be scanned for viruses. The website contains the complete and very extensive list of supported applications.
8. P3Scan
This e-mail proxy server scans both incoming and outgoing messages for viruses, worms, trojans, spam, and other malware. Like most open-source anti-virus tools, it’s based in part on the ClamAV engine. Supported Operating System is Linux.
Anti-Spyware
9. xpy
This is a very small utility that can save your days to think about spam controls on a windows system. This tiny program improves security, improves performance, and closes some of the flaws which opens up Windows to spyware. It disables the Windows "calling home" features, disarms Internet Explorer, disables Windows Media Player and many more.
10. Nixory
This application is only for Firefox users to protect from unwanted cookies and spyware and unlike most similar programs, you won’t need to delete your previously installed anti-spyware or anti-malware programs in order to use it.
Popularity: 2% [?]
