The things you’re describing aren’t really version control systems themselves. Git is a version control system; these are an ecosystem of web-based tools surrounding that version control system.

I don’t know if there’s a good term for these.

kagis

Wikipedia calls them “forges”:

en.wikipedia.org/wiki/Forge_(software)

In free and open-source software (FOSS) development communities, a forge is a web-based collaborative software platform for both developing and sharing computer applications.

For software developers it is an online service to host the tools they need to work and communicate with their coworkers. It provides a workflow to propose modifications and engage in discussions. The goal is to reach an agreement that will allow these modifications to be merged into the software repository.

For users, a forge is a repository of computer applications, a place where bugs can be reported, a channel to be informed of security issues, etc.

The source code itself is stored in a revision control system and linked to a wide range of services such as a code review, bug database, continuous integration, etc. When a development community forks, it duplicates the content of the forge and is then able to modify it without asking permission. A community may rely on services scattered on multiple forges: they are not necessarily hosted under the same domain.