[bradbeattie]

> if only just to have some sort of open-system for rating charities

While the following examples aren't exactly _open_ systems, some organizations address the niche you highlight. Examples: https://www.givewell.org/, https://animalcharityevaluators.org/

[emmanueloga_]

I think _open_ is the important part:

Would make sense if anyone could come up with the score, following some "standard". That way one could make sure that no specific grader has incentives to give good scores speculatively (or even maliciously).

[itsdrewmiller]

I encourage you to explore givewell's site. They are very transparent about their ratings and processes.