Best open source, self-hosted, privacy oriented alternatives for Discord

Discord is favorite place to make communities but it is far from being perfect or the only choice. We have numerous options when it comes to collaborative environment for communities.

Here are a few alternatives that are safe, secure, end to end encrypted, some can be self-hosted and some are open-sourced.

Open source: Element, Mumble, Tox, Matrix, Wire, Mattermost, dirc, Jami, RetroShare, Gitter, Revolt, Fosscord ( discord cloner), Protox, bindr, Conduit, Dialog ...etc.

Self-hosted: Element, Mumble, Matrix, Wire, Mattermost, dirc, Fosscord, Conduit, Dialog, ... etc.

iPhone app: Element, Mumble, Matrix, Wire, Jami, Mattermost, Dialog, dirc,

Privacy oriented chat apps: Session, Element, Status, Signal, Threema, Cwtch, Briar, Tox, Delta Chat, Wickr... etc

Like you can see from the lists above, you can have much better version of the collaborative environment for your community, group or team, aside from Discord.