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#2 Mattermost
Enterprise‑grade, self‑hosted Slack alternative with rich integrations, threaded conversations, and powerful permissions.
#3 Rocket.Chat
Feature‑rich team chat server with real‑time translation, video conferencing, and extensive plugin ecosystem.
#4 Zulip
Threaded, topic‑based chat that keeps discussions organized; supports integrations with GitHub, Jira, and more.
Open federation protocol for secure, decentralized messaging; Synapse is the reference server implementation.
#6 Element
Official Matrix client offering end‑to‑end encryption, bridges to other networks, and a sleek web/desktop UI.
#7 Gitter
Chat rooms built around GitHub/GitLab projects; open‑source core lets you host your own instance.
#8 Converse.js
Web‑based XMPP chat client that can be embedded in any site; supports group chats, file sharing, and bots.
#9 Kandan
Simple, self‑hosted chat platform focused on minimalism and ease of deployment.
#10 Chatwoot
Open‑source customer support chat that can double as a developer help‑desk; integrates with Slack, GitHub, and email.
#11 Jami
Decentralized, peer‑to‑peer communication suite with chat, voice, and video; no central server required.
#12 Tox
Fully encrypted, peer‑to‑peer messenger with group chat support; works across desktop and mobile.
#13 Wire
Open‑source secure messaging platform offering end‑to‑end encryption, file sharing, and collaboration tools.
#14 Mumble
Low‑latency, open‑source voice chat primarily for developers and gamers; includes text chat overlay.
Self‑hosted web client for Matrix with rich UI, theming, and integration capabilities.
Kanban‑style collaboration add‑on for Mattermost, enabling visual task tracking alongside chat.
Embedded website chat widget powered by Rocket.Chat, allowing developers to provide real‑time support.
#18 Zulip Mobile
Official Android and iOS clients for Zulip, delivering threaded discussions on the go.
Lightweight, Go‑based Matrix homeserver alternative to Synapse, ideal for low‑resource deployments.
Native iOS and Android apps for Mattermost, offering full feature parity with the desktop experience.
Cross‑platform Electron client for Rocket.Chat, providing a native‑like desktop experience.
#22 Zulip Desktop
Electron‑based desktop client for Zulip with offline support and native notifications.
Electron wrapper for the Element web client, delivering a full‑featured desktop messenger.
Repository of community‑built plugins that extend Mattermost with CI/CD alerts, code review bots, and more.
Framework for building custom Rocket.Chat apps (bots, integrations, UI extensions) using JavaScript/TypeScript.
#26 Zulip Bot API
Simple HTTP‑based API for creating bots that can respond to messages, post alerts, and integrate with CI pipelines.
Push notification gateway for Matrix, enabling mobile and desktop clients to receive real‑time alerts.
Tool for exporting Mattermost data (posts, files, users) to JSON/CSV for analytics or migration.
Built‑in OAuth2 provider allowing other services to authenticate via Rocket.Chat credentials.
Collection of ready‑made integrations (GitHub, GitLab, Jenkins, etc.) that post events directly into Zulip streams.