TortoiseSVN - The coolest interface to (Sub)version control
openDesktop.org - The website openDesktop.
Xversion - Super easy enterprise class version control.
SourceForge - The Complete Open-Source and Business Software Platform.
RapidSVN - CollabNet, Facilitating Collaborative Software Development
Freecode - Freecode (formerly known as Freshmeat) is one of the legit open source development platforms that will be the key for developers and programmers to have a streamlined process via having enhanced collaboration and coding leverages.