Element
A Matrix chat client for rooms, direct conversations, and community collaboration.GetAGPL-3.0+ OR GPL-3.0+
Free, open-source alternatives to Slack
A team chat service organised into channels and direct messages, with calls, file sharing and app integrations.
Slack is a messaging service for teams. Conversations are organised into channels and direct messages, with threads, file sharing, audio and video calls, and integrations with other work tools. Workspaces are hosted by Slack.
The open-source apps below are desktop clients for team chat platforms that do the same core job, and their servers can be self-hosted or used through a provider. Element connects to the decentralised Matrix network, Mattermost Desktop and Rocket.Chat offer channel-based chat with several servers or workspaces in one window, and Zulip organises conversations into streams and named topics. Each needs an account on a matching server.
Apps That Replace Slack
4 free, open-source alternatives
Mattermost Desktop
The desktop app for Mattermost team chat, with several servers in one window, notifications and unread badges.GetApache-2.0
Rocket.Chat Desktop
The official desktop client for Rocket.Chat team chat servers, with several workspaces in one window.GetMIT
Zulip Desktop
The official desktop client for Zulip team chat, with multiple organizations, notifications and inline replies.GetApache-2.0
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