YouTrack - Free, online, easy-to-use, fully customizable issue tracking and agile project management tool your development team will love, by JetBrains. Our cloud or your server.
Git - Git is a free and open source version control system designed to handle everything from small to very large projects with speed and efficiency. It is easy to learn and lightweight with lighting fast performance that outclasses competitors.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Atlassian Bitbucket Server - Atlassian Bitbucket Server is a scalable collaborative Git solution.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Mercurial SCM - Mercurial is a free, distributed source control management tool.