GitHub is described as 'Web-based Git hosting service facilitating collaboration, with features like issue tracking, social networking, and wikis for project management' and is a leading source code hosting service in the development category. There are more than 100 alternatives to GitHub for a variety of platforms, including Web-based, Self-Hosted, Linux, Windows and Mac apps. The best GitHub alternative is GitLab, which is both free and Open Source. Other great apps like GitHub are Codeberg, Gitea, Bitbucket and SourceForge.
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.
A Git instance powered by Forgejo (a free and open-source self-hostable Git software), hosted by Disroot, an organization funded by donations and based on principles of freedom, privacy, federation and decentralization.
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.
Focused Git code hosting with CI, artifact registry, issue tracking, Forgejo-based features, web, terminal and AI agent interfaces, transparent EU-only infrastructure, capacity-based pricing, flat storage rates, one-click export, and flexible build options.
Ship awesome Software! Planio is your all-in-one platform, complete with Issue Tracking, Project Management, Version Control, Help Desk, Wikis and Chat.
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.
Azure DevOps Server is a set of collaborative software development tools for the entire team, hosted on-premises. Azure DevOps Server integrates with your existing IDE or editor to help your cross-functional team work effectively on projects of all sizes.
AWS CodeCommit is a managed source control repository that makes it easier for teams to securely collaborate on code with contributions encrypted in transit and at rest.
DAGsHub is a web platform based on open source tools, optimized for data science and oriented towards the open source community.
It is a central location where projects can be hosted, discovered, and collaborated on by contributors.
Kallithea, a free software source code management system supporting two leading version control systems, Mercurial and Git.
An all-in-one DevOps platform combining issue tracking, Git/SVN repositories, wikis, CI/CD, and release management—available as SaaS or on-premise for teams that want one integrated solution.
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Seems to be an alternative to Jira, not to Github.