I was considering making a similar list since I was very interested in checking out alternative chat programs, but I have to say this list isn't that good. A lot of the alternatives here aren't ACTUALLY Discord alternatives.
Most people use Discord for its community features and being able to join massive servers with 1+ million people, follow news, talk in forums, etc... It also has a lot of features people hand-waive like a really good roles system, moderation and server management tools, a bot ecosystem, etc.
Signal is a Whatsapp alternative for 1-on-1 chats with friends and small groups.
Rocket chat is a Slack alternative for people wanting to host a server for a community. It's not a platform, you need to register and login to each server manually.
I haven't used Zulip but AFAIK it's like Rocket Chat.
Ditto on Mattermost.
Discourse is a forum.
Stoat is basically the only thing here that actually competes on Discord and it's really barebones. There isn't a genuine Discord alternative because it turns out it's really hard (and expensive!) to do what it does, kind of like a Youtube alternatives scenario.
Most people use Discord for its community features and being able to join massive servers with 1+ million people, follow news, talk in forums, etc... It also has a lot of features people hand-waive like a really good roles system, moderation and server management tools, a bot ecosystem, etc.
Signal is a Whatsapp alternative for 1-on-1 chats with friends and small groups.
Rocket chat is a Slack alternative for people wanting to host a server for a community. It's not a platform, you need to register and login to each server manually.
I haven't used Zulip but AFAIK it's like Rocket Chat.
Ditto on Mattermost.
Discourse is a forum.
Stoat is basically the only thing here that actually competes on Discord and it's really barebones. There isn't a genuine Discord alternative because it turns out it's really hard (and expensive!) to do what it does, kind of like a Youtube alternatives scenario.