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Are there any FOSS alternatives to Discord that are free (as in money)

Zulip is free for open source projects.

Creating a channel on Matrix.org is free.

Conversations & blabber.im offer free XMPP accounts. I self-host so I haven’t tested whether or not its users can create MUCs on those servers.

Libera.Chat & OFTC offer free IRC for open source—& can depending on the community be a welcome bridged platform for any alternative as IRC requires the least resources to run (tho if you need rooms with encryption, that won’t be an option).

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