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
SourceForge - The Complete Open-Source and Business Software Platform.
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.
Eclipse - Eclipse is an open source community, whose projects are focused on building an open development platform comprised of extensible frameworks, tools and runtimes for building, deploying and managing software across the lifecycle.