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.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.