Any open source alternative to Slack?

Question

Slack is getting expensive, any good scalable alternative to Slack?

plastic_bag · Accepted Answer

We used a self-hosted version of RocketChat at my previous employer's.https://www.rocket.chat/

ezedv · Answer

You might want to check out Mattermost! It's a great open-source alternative to Slack, offering similar features and functionalities.

mdwalters · Answer

i think matrix is a good alternative, after all, you can self-host it

logiczilla · Answer

Mattermost is an opensource Slack clone.

mplanchard · Answer

zulip is another option

Am4TIfIsER0ppos · Answer

IRC