SourceForge is a free website which allows users to host their (open source) projects.
The main feature offered by this kind of service is a code versioning system, which provide source sharing, version control, updates history and parallel development to different brunches - see ([Develop tools - SVN]).
Moreover, SourceForge offers many other useful features which support the developers work:
In this project phase we exploit SVN as version control, the wiki to share our knowledge base and some tematic forums in order to take the decision together and support each other during the issues troubleshooting.
Wiki: Develop tools - Overview
Wiki: Develop tools - SVN
Wiki: KnowledgeBase