FileHippo
http://filehippo.com/
Trusted source of software downloads. Carries older versions of software, like Firefox - very useful!
FileHippo
: 2010
SourceForge Software Map
http://sourceforge.net/softwaremap/
"The Software map will help you quickly navigate around the thousands of projects hosted on SourceForge.net. To use the Software Map, simply click on one of the popular Topics displayed." Shows most downloads and most active for each Topic.
SourceForge
: 2007