GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
openDesktop.org - The website openDesktop.
Redmine - Flexible project management web application
SourceForge - The Complete Open-Source and Business Software Platform.
Bugfender - Cloud logging for your apps, not only crashes matter
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.