Any open-source alternatives? I am looking for: - Voice/video chat with PTT integrated - An okayish chat with search feature I would like to be a part (develo

Any open-source alternatives? I am looking for: - Voice/video chat with PTT integrated - An okayish chat with search feature I would like to be a part (developer) of such project. Spartial channel structure (like in spartial.chat) is a welcome thing — I would like to make some sort of distributed hackspace with that.