If you are looking for open source software then SourceForge is the place to go. I have used SourceForge to search and downloading software and I find it to be one of the best sites available.
If you look up SourceForge on Wikipedia you will be quick to learn that it is a storehouse for source codes maintained by Sourceforge Inc. Software engineers use the site as a centralized location to deal with open source software development. Better try out our Free AntiVirus Download.