Phabricator – GitHub Alternative written in PHP used by the Wikimedia Foundation
I've contributed some code to Phabricator, happy to answer any questions about why that code is so bad.<p>Phabricator is primarily aimed at teams with multiple approximately-full-time engineers working on projects together, and focuses more on scaling up to thousands of engineers than scaling down to personal projects. It may be a poor fit for your needs if you're looking to move very small projects away from GitHub following the acquisition by Microsoft.