SourceForge - The Complete Open-Source and Business Software Platform.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
openDesktop.org - The website openDesktop.
Redmine - Flexible project management web application
OSOR - OSOR is the Open Source Observatory, a project to provide a framework for developing and executing autonomous observations.
Trac - Trac is a project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.