Free, secure and fast downloads from the largest Open Source applications and software directory – SourceForge.net
Here you can find really great free software both for Windows and Linux =)
One of the best sites for developers.
In my eyes a site that you can trust.
Best open source/freeware computer software website on the internet.
Handy but I don't know if this is really safe
Awesome site, TRUSTED
This used to be a good site, but I'm not so sure I'd trust them now: http://arstechnica.com/information-technology/2015/05/sourceforge-grabs-gimp-for-windows-account-wraps-installer-in-bundle-pushing-adware/
One of the most visited sites on the web
Strona o tematyce Linux i open source.