awesome-alternatives

alternatives to

Slack

Hosted team chat with channels, threads and calls. A closed product from Salesforce.

Side by side

ToolFitStarsLicenceTermsSelf-hostedLanguageLatestLast push
Rocket.ChatFull replacement46kOtherOpen coreYesTypeScript8.9.02026-10-06
MattermostFull replacement39kOtherOpen coreYesTypeScriptv11.11.12026-10-06
ZulipFull replacement26kApache-2.0Open sourceYesPython12.32026-10-06
ejabberdPartial6.7kOtherOpen sourceYesErlang26.092026-10-05
CampfirePartial4.7kMITOpen sourceYesRubyv1.5.12026-10-06
SynapsePartial4.7kAGPL-3.0Open sourceYesPythonv1.162.02026-10-06
OpenfirePartial3.1kApache-2.0Open sourceYesJavav5.1.22026-10-01
Wire ServerPartial2.8kAGPL-3.0Open sourceYesHaskellv2026-10-052026-10-06
QuietPartial2.7kGPL-3.0Open sourceNoTypeScript@quiet/mobile@11.3.02026-09-28
MongooseIMPartial1.8kOtherOpen sourceYesErlang6.9.02026-10-01
RavenPartial810AGPL-3.0Open sourceYesTypeScriptv3.0.02026-10-05

Every alternative

Language
Licence
Fit
Terms
Hosting
Deploy with

11 alternatives

Rocket.ChatFull replacement

The Secure CommsOS™ for mission-critical operations

Channels, threads and federation on your own server, with an importer for Slack exports.

Language
TypeScript
Licence
Other
Stars
46k
Latest
8.9.0
Last push
2026-10-06
ejabberdPartial

Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server)

An XMPP server for chat, group chat and presence, with an MQTT broker built in; teams chat through any XMPP client.

Language
Erlang
Licence
Other
Stars
6.7k
Latest
26.09
Last push
2026-10-05
CampfirePartial

Super simple group chat, without a subscription

Rooms, direct messages, file attachments and bots for one organisation, without threads or calls.

Language
Ruby
Licence
MIT
Stars
4.7k
Latest
v1.5.1
Last push
2026-10-06
SynapsePartial

Synapse: Matrix homeserver written in Python/Twisted + Rust

A Matrix homeserver; teams chat through a client such as Element, and can federate with other servers.

Language
Python
Licence
AGPL-3.0
Stars
4.7k
Latest
v1.162.0
Last push
2026-10-06
OpenfirePartial

An XMPP server licensed under the Open Source Apache License.

An XMPP server with a web admin console; teams chat through an XMPP client such as Spark.

Language
Java
Licence
Apache-2.0
Stars
3.1k
Latest
v5.1.2
Last push
2026-10-01
QuietPartial

A private, p2p alternative to Slack and Discord built on Tor & IPFS

Peer-to-peer team chat over Tor with no server, so messages sync only while members are online.

Language
TypeScript
Licence
GPL-3.0
Stars
2.7k
Last push
2026-09-28
MongooseIMPartial

MongooseIM is Erlang Solutions' robust, scalable and efficient XMPP server, aimed at large installations. Specifically designed for enterprise purposes, it is fault-tolerant and can utilise the resources of multiple clustered machines.

A clustered XMPP server built for large deployments; teams chat through an XMPP client.

Language
Erlang
Licence
Other
Stars
1.8k
Latest
6.9.0
Last push
2026-10-01
RavenPartial

Simple, open source team messaging platform

Channels, threads and direct messages inside a Frappe or ERPNext site, linked to its documents.

Language
TypeScript
Licence
AGPL-3.0
Stars
810
Latest
v3.0.0
Last push
2026-10-05

Head to head

About Slack

Vendor
Salesforce

Slack website ↗