sunbeam.city is one of the many independent Mastodon servers you can use to participate in the fediverse.
Sunbeam City is a anticapitalist, antifascist solarpunk instance that is run collectively.

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toxicodendron radicans

The Event Horizon Telescope, incidentally, is a fantastic example of a large scale decentralised non-governmental collaboration.

That black hole image was taken using 8 separately managed radio telescopes scattered across the planet. It was organised by scientists working in 60 different research institutes in 17 countries across 6 continents. With no motive beyond trying to learn something which they didn't know before.