Phabricator is a collection of open source web applications that help software companies build better software. Review code, track bugs, manage tasks, host repositories, and more!
Lacks available extensions or plugins, and extending functionality requires custom programming.
Management of content and data is relatively straight forward, but there may be a bit of a learning curve. Some programming experience may be required.
Has a smaller active community. Limited support is available either for free or as a paid service. Adequate documentation is available.