A free and open source alternative to paid git hosting services like GitHub and Bitbucket. GitLab is an incredibly powerful self-hosted code collaboration platform, git repository manager, issue tracker and code reviewer. It's available for several Linux distributions including Ubuntu, Debian and CentOS and it integrates with third party issue trackers and continuous integration services. You can also get a subscription which gives you access to their support team and GitLab Enterprise Edition that contains extra features aimed at larger organisations. A great option if you want private repos without the cost.