I do want to say Matrix. You'd have to find a server first --> https://joinmatrix.org/ .With its discord bridge, it does allow users to switch to matrix and still be in the community if the community is bridged.

Matrix also supports voice chat rooms and video chat rooms. It isn't monetized so there aren't custom stickers, premium accounts, and so on, but if more people used matrix and donated, maybe that'll happen. Someday.

CC BY-NC-SA 4.0

I love the Element client for Matrix. I use it with my friends and I have joined a lot of communities on there. It's Discord-like, but I personally find it much easier to navigate than Discord. It's free, open source, decentralized, you can self-host if that's your jam, it's got some solid security and usability features, call quality is great, and I've found it to be very stable and reliable. I'm a little biased because I personally don't like Discord, I find the UI clunky and unpleasant to use, but I love using Element. If you love Discord, you will find Element familiar, but you may or may not appreciate the differences.

There's Matrix, but I think the under-development is a similar story there, to speak nothing of the infrastructure and UX of Discord that would be hard to pull people away from.

I recently started my own Matrix home server. It seems fine for chatting. "Communities" has been replaced by Spaces can act like Discords servers, Inside of that space you can nest other spaces or rooms which would be like channels in discord. Element recently added video channels as an experimental feature. and it looks like you can disable webcam and only allow mic when you connect to one so it could act as a "voice channel". Overall it is pretty basic in features but usable. It doesn't help that the available features are different depending on the client used. Bridging is great, I have discord, signal, and sms coming to element on my computer so I only have one application for all of my messaging. I'm looking forward to the further development of Matrix. Voice rooms, custom emoji, and adding gifs to chat would make it basically perfect for me

Originally I was looking into Revolt but couldn't get a self hosted instance running. My experience with system admin is pretty limited so this was likely an error on my part. I don't like that accounts can't be federated so users would have to make a separate account for each revolt server which would be a pain. The developers have stated that as a case against self hosting and prefer users join their centralized server to grow the platform. Last time I checked they aren't looking into a way to add it since it sounds like it would have to heavily overhaul the protocol. This is one of the main reasons I went with matrix. Issue #25 on their github has a lot of troubleshooting and discussion of people trying to self-host I recommence reading through it if you are planning on setting it up, although If I remember correctly voice chat is not functional on a third-party servers. If self hosing isn't an goal then most of this is irrelevant.

Spacebar chat was also mentioned in another comment. I'm gonna have to look into it and see how it compares to matrix

Revolt seems like it would be a good replacement if it gets to a stable point.

Other than that everything else is nowhere within miles of being a discord replacement. The best option IMO would be a regular chat server like Matrix/Element or something, and Teamspeak or Mumble for voice. But you won't have streaming, screen sharing, etc.

Everything like Element, Jitsi, and so on are replacements for stuff like Slack, they don't have easy to use voice rooms or streaming or anything like that.

the most "drop-in" replacements I know of aimed towards users (not companies) are

• Matrix + Element Client: Supports E2EE and voice + video chat, it works very well, but the onboarding experience of federated platforms is still confusing for some, and along with that they have to change knowledge of guild/channel type chats to space/room. I don't use this.
• Tailchat: Very similar experience to Discord while not being it. It's functionality is extended through plugins. Integrating all the services I use into one app is not as bad of an idea as it sounds, and I like the implementation very much, as do my friends. That being said, it's, very bare-bones in it's current state, and not much you can add through said plugins besides voice + video chat and bots. This is what I use right now.
• Spacebarchat: Very very alpha, but the end goal is very promising, that being complete backend compatibility with anything designed for Discord. The official client will not be finished anytime soon, so you have to bring your own Discord-compatible client and modify the endpoints to connect to and get any major use out of a Spacebar instance. Voice and Video chat still isn't there yet, but most all other things work as expected. I keep my eye on it, and will probably use it later on in it's more finished stages.

Color me surprised.

I loathe that platforms treat themselves this way. We see this happen over and over again when a newcomer comes into the field to shake things up. They become, eventually, the best alternative. They eventually become the only thing.

And all that they turn out to be, are just portfolio fluffing projects to be made into an IPO. Then the enshittification and oh, there is next to no where to go.

What a world...

I was wondering what happened to the Discord IPO. Discord already went to shit, I don't know what else an IPO could do to it? More restrictions?

Damn, this is going to be way more tricky than migrating away from Reddit. I have too many "servers" and friends on that platform so moving to matrix or something else seem unfeasible :(

There's also Linen.

The tough part for me is going to be plugins and such. pbd groups use a lot of dice rollers and initiative trackers and such.

went back to teamspeak but i doubt that it is FOSS

what about rocket chat? https://www.rocket.chat/

~~Guilded.gg?~~ not FOSS - I didn't notice the post community