GitLab is described as 'Offers on-premise or hosted Git repository management, including issue tracking, wikis, code reviews, and continuous integration and deployment' and is a leading Version Control system in the development category. There are more than 100 alternatives to GitLab for a variety of platforms, including Web-based, Self-Hosted, Linux, Mac and Windows apps. The best GitLab alternative is GitHub, which is free. Other great apps like GitLab are Gitea, Gogs, Codeberg and Bitbucket.
Trac is an enhanced wiki and issue tracking system for software development projects. Trac uses a minimalistic approach to web-based software project management. Our mission is to help developers write great software while staying out of the way.
Jenkins is a fork of Hudson and is a continuous build system for software projects.
Continuous Delivery Services for teams to share code, track work, and ship software – for any language, all in a single package.
Phorge is an open source, community driven platform for collaborating, managing, organizing and reviewing software development projects.
Open-source platform unifying project, document, issue, and task management with real-time team collaboration, instant messaging, video conferencing, and GitHub bidirectional sync, all in one customizable workspace for developers and product teams.
Free private Git repositories, pull requests, and code search. Get unlimited private Git repository hosting and support for TFVC that scales from a hobby project to the world’s largest repository.
Tuleap is the first fully libre and open source software (GPL licence) for Enterprise Application Lifecycle Management. Tuleap is provided by the Enalean company and the community members.
Kallithea, a free software source code management system supporting two leading version control systems, Mercurial and Git.
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.
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.
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Despite its name, GitLab is not only version control, is a suite of cloud based solutions around source code.
That being said, Trac is an alternative only speaking about Wiki and Issue Tracking system, both features of GitLab that can be enabled/disabled per each repo/project/group