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If partnering with an existing org, Software Freedom Conservancy would seem like the right one.

Or OpenCollective.

AFAICT OpenCollective currently is not a 501c3, they are a VC funded for-profit company, although it sounds like they might be changing that.

They do run a 501(c)(3) fiscal host though, but I'm not sure if Lichess would fit its charitable purposes:

- increasing access to educational resources and training

- creating a positive social impact

- developing tools to improve civic participation within cities or communities