GitLab

Software Forge - GitHub competitor. t follows an open-core development model where the core functionality is released under an open-source (MIT) (most of it is RubyOnRails) license while the additional functionality such as code owners,[13] multiple issue assignees,[14] dependency scanning[15] and insights[16] are under a proprietary license. https://en.wikipedia.org/wiki/GitLab

The Wiki Engine is based on Gollum