The best open source alternative to GitHub is GitLab. If that doesn't suit you, our users have ranked more than 100 alternatives to GitHub and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to GitHub are Gitea, Codeberg, Gogs and Forgejo.
Phorge is an open source, community driven platform for collaborating, managing, organizing and reviewing software development projects.
Mantis Bug Tracker is a free and open source, web-based bug tracking system. It is written in the PHP scripting language and works with MySQL, MS SQL, and PostgreSQL databases and a webserver. MantisBT can be installed on Windows, Linux, Mac OS, OS/2, and others.
I like notabug, it's an alternative to big complex git servers like github, where most of the features I don't need. If you use git server only for a git, notabug is a good option.
Design is very similar to GitHub
GitHub is the best. I like the features. The only thing we need to tell is support php, Java ertc
Fast and powerful management tool for SVN, Mercurial, and GIT with a built in push/pull server and full text search and code-review. It works on http/https and has a built in permission/authentication system with the ability to authenticate via LDAP or ActiveDirectory.
Apache Allura is an open source implementation of a software forge, a web site that manages source code repositories, bug reports, discussions, wiki pages, blogs, and more for any number of individual projects.
JitHub is a third party UWP client for github.com. You can use JitHub to manage the code, issues, pull requests, commits and much more in your repositories.
Kallithea, a free software source code management system supporting two leading version control systems, Mercurial and Git.
GitFox is your application to manage GitLab projects using an intuitive interface. In addition, it is a showcase of the "Clean Architecture" concepts and some useful libraries.
GitGud.io is a free Git hosting site powered by GitLab, hosted by Sapphire. Sign up for FREE, via Sapphire Accounts
GitPrep is a GitHub clone. You can install portable Github system into Unix/Linux. You can create users and repositories without limitation. This is free software.
For the self-hosting category, it has literally zero dependencies. Every repository is plain as-is-on-the-harddrive, so you have no troubles like in other alternatives with bare repos vs. real repos. Simple install, zero dependencies, works on every VPS.
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Easy to use, no tracking, work without JS, lightweight and customizable.