Astalavista Security Group has a beta page up that lists top freeware products in various categories including Data Recovery, Anti Virus-Tools, Firewall and IDS, and Anti-Spyware. The list contains some of the freeware tools that I already reviewed here on Ghacks but also several that may be new to you. So, a mix of popular applications that everyone knows and some lesser known apps that you may find useful as well.
Page loads a little bit slow but it's worth the wait. I will check some of the tools out that I did not try out until now and if I find a gem review it here at ghacks.net.
Update: Astalavista has changed quite a bit in recent years. The security tools download page is for instance no longer available on the site. It now displays a list of security news taken directly from the web site's start page. The top navigation links to a tools section, but those are online tools like converters, dns tools, encryption and decryption utilities or information gathering apps.
I suggest you take a look at alternatives. One of them is Softpedia's Security page that is listing security related tools in eight different categories (decrypting and decoding, encrypting, firewall, keylogger and monitoring, lockdown, password managers and generators, secure cleaning, and security related).
A click opens the actual program listing sorted by release date and update, whichever is newer. Please note that the page displays both free and commercial applications. Softpedia marks that under license directly on the listing pages, which makes it easy to find the freeware programs among the selection.
Another option is the Security List over at Techsupport Alert which offers extensive lists of programs that are considered to be among the best in their respective field. The list is divided into 25 different categories, from realtime protection and HIPS to vulnerability scanning and sandboxing.