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Briar is older than Matrix. It has been around since at least mid-2012, whereas Matrix is from 2014.

Disclosure: I was an intern for them in mid-2012.

Thanks that's really interesting. Does Briar have multiple client implementations like a documented protocol or something too?

briar is built on a p2p syncing protocol called bramble, you can read more here: https://code.briarproject.org/briar/briar/-/wikis/A-Quick-Ov...