Communication

Open source communication tools in this category cover three different jobs: customer-facing messaging, internal team chat, and video or audio conferencing. Chatwoot and Zammad are customer communication platforms rather than internal chat tools: Chatwoot combines a website chat widget with email, WhatsApp, and social messaging into one shared inbox for support teams, while Zammad adds structured ticketing, SLAs, and a knowledge base on top of multi-channel intake. Both are commonly deployed as the customer-facing layer between a business and its users, distinct from tools meant for employees talking to each other.

Zulip is internal team chat, built around threaded topics inside channels rather than a single flat stream of messages, which keeps long-running or async discussions easier to follow than tools where every message lands in one scrolling feed. It is a direct open source alternative to Slack or Microsoft Teams, with the same core features (channels, direct messages, search, integrations) plus stronger message threading.

Jitsi Meet, LiveKit, and BigBlueButton handle audio and video rather than text. Jitsi Meet is a ready-to-use video conferencing app, comparable to Zoom or Google Meet, that can be self-hosted and embedded, and needs no account to join a call. LiveKit is lower-level: a WebRTC infrastructure and SDK for developers building real-time audio, video, or streaming features into their own applications, not a finished meeting app by itself. BigBlueButton is purpose-built for online teaching, with virtual whiteboards, breakout rooms, polling, and integrations for learning management systems like Moodle and Canvas, aimed at classrooms rather than general business meetings.

The choice mostly comes down to what is being built versus what is being deployed as-is. A team that wants a working video call app today, with no development work, reaches for Jitsi Meet. A team building a product feature that needs live video or audio, such as a telehealth or livestreaming feature, needs LiveKit's SDKs instead of a finished meeting app. A school or training organization running online classes is better served by BigBlueButton's classroom-specific tools than a general meeting app. For text-based collaboration, Zulip fits internal team communication, while Chatwoot and Zammad fit customer-facing support conversations. Self-hosting keeps call and message data on infrastructure the team controls, which matters for institutions with data residency or privacy requirements, particularly in healthcare and education.