Alternatives to Slack

Team collaboration hub for messaging and shared work tools

Campfire

Open-source alternative to Microsoft Teams, Pumble, and Slack — Self-hosted group chat with mentions and mobile support

Cinny

Open-source alternative to Discord, Microsoft Teams, and Slack — Secure Matrix client with end-to-end encryption for team messaging

3.7k 540 2mo

Element

Open-source alternative to Discord, Microsoft Teams, and Slack — Encrypted open-source platform for secure team communication and collaboration

13.2k 2.7k 2mo

Fluxer

Open-source alternative to Discord, Guilded, and Slack — Open-source messaging platform with Markdown and VoIP support

9.1k 527 2mo

Mattermost

Open-source alternative to Guilded, Microsoft Teams, and Slack — Open-source team collaboration platform for secure messaging and workflows

37.9k 8.7k 2mo

Mezon

Open-source alternative to Discord, Microsoft Teams, and Slack — Self-hosted community platform for gaming, chatting, and social spaces

1.5k 50 2mo

Nextcloud

Open-source alternative to Google Drive, Microsoft Teams, and Slack — Self-hosted file sync and collaboration with privacy features

35.8k 5.0k 2mo

Quiet

Open-source alternative to Discord, Slack, and Telegram — Privacy-focused, peer-to-peer messaging app without central servers

2.6k 138 2mo

Rocket.Chat

Open-source alternative to Discord, Microsoft Teams, and Slack — Self-hosted messaging platform with voice, video, and AI integration

45.5k 13.7k 2mo

SAMA

Open-source alternative to Discord, Microsoft Teams, and Slack — Open-source encrypted chat server with clustering support

156 14 3mo

Stoat

Open-source alternative to Discord, Slack, and Telegram — Self-hosted group chat with voice and moderation under EU privacy

3.1k 359 2mo

Twake Chat

Open-source alternative to Microsoft Teams, Skype, and Slack — Self-hosted, encrypted messenger with multi-platform bridges and Matrix support

159 44 2mo

Valour

Open-source alternative to Discord, Guilded, and Slack — Privacy-first communication platform with multi-window chat and economy

388 39 2mo

Wire

Open-source alternative to Discord, Microsoft Teams, and Slack — Encrypted collaboration platform for messaging, file sharing, and video calls

2.5k 180 7mo

Zulip

Open-source alternative to Microsoft Teams, Slack, and Twist — Open-source team chat with threaded conversations for organized communication

25.4k 9.9k 2mo