Alternatives to Slack
Team chat with a large integrations ecosystem
A team messaging platform centered on channels, search, and integrations, used for coordination across projects.
Include proprietary
Order
Element
Matrix client for secure room-based messaging
collaborationmatrix
Updated 2/20/2026Apache-2.0
Jitsi Meet
Open-source video conferencing with WebRTC
collaborationvideo-conferencing
Updated 2/20/2026Apache-2.0
Matrix (Synapse)
Matrix homeserver for hosting federated chat
collaborationmatrix
Updated 2/20/2026Apache-2.0
Mattermost
Self-hosted team chat with integrations
collaborationteam-chat
Updated 2/20/2026AGPL-3.0
Nextcloud Talk
Chat and video calls inside Nextcloud
collaborationvideo-calls
Updated 2/20/2026AGPL-3.0
Rocket.Chat
Self-hosted team chat and messaging
collaborationteam-chat
Updated 2/20/2026MIT
Zulip
Topic-based team chat for async communication
collaborationteam-chat
Updated 2/20/2026Apache-2.0