11+ Best Free Open Source Tools for Code Review & Collaboration

These tools streamline peer reviews, track changes, and enhance team workflows. Popular options like Git, Gitea, and Review Board support version control, inline comments, and seamless collaboration across distributed teams.

20 Best Code Review Tools For Developers [2025 Guide]

https://thectoclub.com/tools/best-code-review-tools/

A comprehensive review of 20 code-review tools, highlighting free and open-source options such as GitHub, GitLab, Gerrit, RhodeCode (community edition), Review Board, and Peer Review Plugin for Trac.

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12 Best Code Review Tools for Developers

https://kinsta.com/blog/code-review-tools/

A breakdown of code review tools, emphasizing open-source and free tools like Review Board, Gerrit, RhodeCode community edition, Peer Review for Trac, GitHub PR reviews, and Reviewable for open-source repos.

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7 Code Review Tools to Balance Quality and Speed

https://www.atlassian.com/blog/loom/code-review-tools

Atlassian blog highlighting GitLab as an open-source Git repo with integrated code review and collaboration features (merge requests, approvals, automation).

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Gerrit Code Review

https://www.gerritcodereview.com/

Official site for Gerrit — a free, web-based team code collaboration and review tool that integrates closely with Git and allows approving or rejecting changes via a browser interface.

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Phabricator

https://phacility.com/phabricator/

Phabricator is a free, open-source suite of web-based development collaboration tools including Differential (code review), repository browser, bug tracker, and wiki; integrates with Git, Mercurial, and Subversion.

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Review Board

https://en.wikipedia.org/wiki/Review_Board

An open-source, web-based collaborative code review tool (MIT-licensed) that supports many VCS (Git, Mercurial, SVN, Perforce, etc.) and is free for both personal and commercial use.

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Kallithea

https://en.wikipedia.org/wiki/Kallithea_%28software%29

Free software (GPL-licensed) providing Git and Mercurial hosting with collaboration features like code review, pull requests, issue tracking, and forking – a community fork of RhodeCode.

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Gitea

https://en.wikipedia.org/wiki/Gitea

A free, community-driven Git forge written in Go, offering code review, pull requests, CI/CD, issue tracking and wiki features—ideal for lightweight self-hosting collaboration.

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Sider (Automated Code Review)

https://en.wikipedia.org/wiki/Sider_%28Automated_Code_Review%29

An automated code review tool that integrates with GitHub pull requests to scan for style issues, complexity, duplication, and security; free for open-source projects.

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A Beginners Guide to Code Review

https://www.youtube.com/watch?v=48vMaDUv530

YouTube video sharing methodology and best practices for getting started with code reviews, including useful resources and tools.

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Cracking the Code Review by Paco van Beckhoven

https://www.youtube.com/watch?v=zyLP8hFsKo8

A YouTube talk emphasizing the importance of code reviews for ensuring code quality and fostering team collaboration.

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