Is there an open source project management system?

Question

Project management

Problem
There is an Open Source project in GitHub, led by one person and, in view of this circumstance, developing slowly and very one-sidedly.
Objective
There are a number of people who are willing to form a maintainer board and the goal is to hand over control of the project to them.
Q.
Are there systems in place to allow the maintainer council to approve or reject issues and pull requests by voting? Such a system should limit the ability of the minority to act against the will of the majority.

Answer 1

Just add them as project developers on GitHub.
All changes through a pull request, so that at least 1-2 do review.
Ideas are discussed in issues, implementations in pull requests.
You, as the author of the project, have the right to veto changes if you want, but in general, the developers will do everything themselves.
You can also make an organization in GitHub, where it is more convenient to differentiate access.
For example, there is a HybridAuth project, at some point the developer stopped doing anything in it. After a while, it became clear that a little more and the project would die - as a result, they reached out to the developer and he handed over control to three volunteers - now they, along with the rest of the developers, decide for themselves what and where to move. Essentially your situation.