GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
Discover projects, groups and snippets. Share your projects with others
Code for the future developer portal.
Code for the Tor manual in https://tb-manual.torproject.org/
Code for https://support.torproject.org