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Core Contributors and their repos
Core Contributors to the Open edX Project
CCs on a repo can provide review and formal approval for a PR and merge it.
Many repos do not have CCs or have so few that they may not be able to handle all incoming OSPRs. In this case, you would need to get 2U (or possibly tCRIL) reviewers to approve and merge PRs.
Backstage
https://backstage.openedx.org/catalog?filters%5Bkind%5D=component&filters%5Buser%5D=all
This tool allows you to see details about various GitHub repositories, including who the maintainers are. You can use this information to ping maintainers on PRs.
NOTE! This is still a pilot and only a handful of repos are represented.
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