alternative · slack
Open Source Slack Alternatives
Practical open source team chat platforms that can replace Slack — self-hosted messaging, channels, calls, and integrations, with full ownership of your conversations and data.
Tools that replace Slack
5 tools// open source tools you can use instead
project-management
Huly_
All-in-one workspace replacing Jira, Slack, and Notion.
27.8k
stars
131
contributors
1d
last commit
2.2k
forks
TypeScript
language
5 yrs
age
team-chat
Mattermost_
Self-hosted team chat — a Slack alternative.
39.2k
stars
1.2k
contributors
today
last commit
9k
forks
TypeScript
language
11 yrs
age
team-chat
Rocket.Chat_
Open source team chat — a Slack and Teams alternative.
46.2k
stars
1.1k
contributors
today
last commit
13.9k
forks
TypeScript
language
11 yrs
age
team-chat
Tuwunel_
Rust Matrix homeserver — a self-hosted Slack alternative.
2.6k
stars
216
contributors
today
last commit
222
forks
Rust
language
1 yr
age
team-chat
Zulip_
Topic-threaded team chat — a Slack alternative.
26k
stars
1.3k
contributors
today
last commit
10.3k
forks
Python
language
11 yrs
age