OpenPost
Open-source social scheduling with image, video and meme editors built in
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OpenArcanum
Community chat with channels, roles and calls on servers you run, no accounts
Communities wary of ID checks and data mining get channels, voice and moderation on a server they run, with relays that only see encrypted traffic.
OpenArcanum has the parts a Discord server needs: text channels, roles, moderation, voice and video with screen share, and encrypted direct messages. Identity is a key made on your own device, and each community gets its own key so they cannot be linked. Each community runs its own server, even at home, with no open port. It is AGPL, in public beta on the web and desktop, and has not been independently audited. Mobile apps come later.
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