Open-source alternatives to Microsoft Teams

Secure communications platform for team collaboration — The Secure CommsOS™ for mission-critical operations

↔ alternative to Slack、Microsoft Teams

Self-hosted team chat and collaboration platform — Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

↔ alternative to Slack、Microsoft Teams

Organized team chat with topic-based threading — Zulip server and web application. Open-source team chat that helps teams stay productive and focused.

↔ alternative to Slack、Microsoft Teams

macOS menu bar calendar — 🇺🇦 Your meetings at your fingertips in the macOS menu bar

↔ alternative to Zoom、Google Meet、Microsoft Teams

Secure open-source team collaboration platform — Twake is a secure open source collaboration platform to improve organizational productivity.

↔ alternative to Slack、Microsoft Teams

Matrix chat client written in Go — A Matrix client written in Go.

↔ alternative to Slack、Microsoft Teams、Discord

Desktop client for Rocket.Chat messaging — The Secure CommsOS™ for mission-critical operations

↔ alternative to Slack、Microsoft Teams

Instant messaging chat application — RelatedChat

↔ alternative to Slack、Microsoft Teams

Collaborative real-time web chat application — Collaborative chat done right

↔ alternative to Slack、Microsoft Teams

Desktop Matrix client for chat and collaboration — A glossy Matrix collaboration client for desktop.

↔ alternative to Slack、Microsoft Teams

Cross-platform chat and communication desktop app — :computer: Wire for desktop

↔ alternative to Slack、Microsoft Teams

Web chat with DMs, groups, media and WebRTC calls — go-chat.使用Go基于WebSocket开发的web聊天应用。单聊，群聊。文字，图片，语音，视频消息，屏幕共享，剪切板图片，基于WebRTC的P2P语音通话，视频聊天。

↔ alternative to Slack、Discord、Microsoft Teams

Virtual meeting rooms with spatial audio via Jitsi — Virtual Meetups through Jitsi

↔ alternative to Zoom、Microsoft Teams、Google Meet