SourceForge is a Web-based service that offers software developers a centralized online location to control and manage free and open-source software projects Developed by Slashdot Media
License: Free
SourceForge is a more comprehensive project management and collaboration platform with strong community support, while Kallithea excels in version control with a focus on Git and Mercurial. SourceForge offers a wide array of features including issue tracking and analytics, but Kallithea is lightweight and provides strong self-hosting capabilities.