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💬 Team Communication

Chat, messaging, and voice platforms for teams — open source replacements for Slack, Discord, and WhatsApp.

Popular SaaS in this category

Tap any tool to see curated open source alternatives with honest strengths and weaknesses.

Alternatives to Slack

Team messaging with channels, threads, and integrations.

4 alternatives

Alternatives to Discord

Voice, video, and text chat — popular with gamers and communities.

3 alternatives

Alternatives to WhatsApp

Global mobile messaging.

2 alternatives

Alternatives to Microsoft Teams

Video, chat, and collaboration bundled with Microsoft 365.

4 alternatives
Ad slot — category middle

Open source projects in this category

Mattermost

Slack-style open source team messaging.

License: AGPL-3.0 / Apache-2.0 (modules) Self-host: ★★★☆☆

Rocket.Chat

Open source team and community chat with video and voice.

License: MIT (community); proprietary modules available Self-host: ★★★☆☆

Zulip

Threaded team chat with topics.

License: Apache-2.0 Self-host: ★★★☆☆

Element (Matrix)

Decentralized messaging on the Matrix protocol.

License: Apache-2.0 Self-host: ★★★★☆

Signal

Encrypted messaging for individuals and small groups.

License: AGPL-3.0 / GPL-3.0 Self-host: ★★★★★

Other categories you might like

🎥 Video Conferencing

Meetings, webinars, and virtual classrooms — self-hosted alternatives to Zoom, Google Meet and Microsoft Teams.

📋 Project Management & Kanban

Task boards, sprints, roadmaps, and issue tracking — open source alternatives to Asana, Jira, Trello, and Monday.

☁️ File Storage & Sync

Cloud drive and file synchronization — replace Dropbox, Google Drive, and OneDrive with self-hosted options.

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