this post was submitted on 21 Sep 2025
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[–] reddig33@lemmy.world 38 points 2 days ago* (last edited 2 days ago) (13 children)

Slack is so overrated. Isn’t there similar open source software for this, that businesses could run from their own server?

[–] Nikokin@lemmy.world 8 points 2 days ago (3 children)
[–] otacon239@lemmy.world 12 points 2 days ago (2 children)

I recently went with Mattermost because its structure is a lot simpler and doesn’t use federation. Probably more than enough for most small use cases.

I’ve tried Matrix/Element in the past and imo, there’s way too much setup for simple little internal applications, even via docker.

[–] adavis@lemmy.world 9 points 2 days ago (1 children)

FYI there are alternative matrix servers to Synapse. I'm playing around with Tuwunel, it's a single binary and you're done.

It uses rocksdb so you just give it a directory and it puts everything there,. ie no need to spin up a db. And there is a config option to disable federation if that's something you don't want.

Could it scale to thousands of concurrent users? Probably not but it seems to be the simplest chat app to self host I've found.

[–] otacon239@lemmy.world 3 points 2 days ago

I’ll look into this. Thanks for the recommendation!

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