GitLab Inc. is an open-core company that operates GitLab, a DevOps software package which can develop, secure, and operate software. The open source software project was created by Ukrainian developer Dmytro Zaporozhets and Dutch developer Sytse Sijbrandij

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

Both GitLab and GitHub use Git a distributed version control system, that can be used to store, view and edit TiddlyWiki wikis using GitLab Pages

Learn more at: Saving to a Git service