GitLab is a web-based version control software based on git and adds additional features such as branch management bug tracking and continuous integration. It is developed in Ruby.
GitLab Community Edition (CE) is being developed open-source and uses the MIT-License. Since August 2013 GitLab Inc. is providing the enterprise-grade Enterprise Edition (EE) which includes more features than the Community Edition.
GitLab.com is the Software as a Service alternative and runs itself on a Enterprise Edition. It is free of charge and supports private and public repositories.