Best Self-hosted Communication & Collaboration tools in 2026
168 self-hosted open source alternatives in this category
168 services found

AppFlowy
Open-source collaborative workspace and Notion alternative
Open-source, privacy-focused collaborative workspace for notes, databases, kanban boards and AI-assisted writing; desktop, mobile and web clients with local-first storage...

AFFiNE
Open-source, local-first knowledge workspace for docs, whiteboards and databases
All-in-one, privacy-focused workspace that merges docs, whiteboards and databases with real-time collaboration and multimodal AI assistance.

Rocket.Chat
Self-hosted secure team chat with voice, video, and omnichannel
Rocket.Chat is an open-source communications platform for secure team messaging, channels, DMs, voice/video, integrations, and customer omnichannel support.


Novu
Open-source notifications infrastructure for inbox and multi-channel delivery
Novu is an open-source notifications platform with a unified API, workflow orchestration, and embeddable in-app inbox for email, SMS, push, and chat.

Mattermost
Secure, self-hosted team collaboration and messaging platform.
Open-source, self-hosted messaging platform for secure team collaboration with real-time chat, audio calls, screen sharing, and integrations.


Nextcloud
Open-source collaboration platform for file sync and groupware
Nextcloud is an open-source content collaboration platform providing file sync & share, groupware (calendar, contacts, mail), real-time office editing, chat and video con...


ntfy
HTTP-based pub-sub push notification service via PUT/POST
ntfy is a lightweight HTTP pub-sub service to send push notifications to phones, desktops, and browsers via PUT/POST or a REST API.

Jitsi Meet
WebRTC-based video conferencing for the web and mobile
Self-hostable WebRTC video conferencing with chat, screen sharing, moderation tools, and SDKs for embedding meetings into web and mobile apps.
SRS (Simple Realtime Server)
High-performance real-time media server for live streaming and WebRTC
SRS (Simple Realtime Server) is a high-efficiency media server supporting RTMP, WebRTC, HLS, HTTP-FLV, SRT, MPEG-DASH, and GB28181 for real-time streaming.

Chatwoot
Open-source omnichannel customer support and live chat platform
Chatwoot is an open-source customer support platform with a shared inbox for live chat, email, and messaging channels, plus automation, reporting, and a help center.

Zulip
Organized team chat with topic-based threading
Open-source team chat server with topic-based threading for focused, asynchronous, and real-time communication in distributed teams.

Huly
All-in-one platform for project management, docs, and team chat
Huly is an open-source all-in-one platform combining project management, team chat, and collaborative documentation as an alternative to tools like Jira, Linear, Slack, a...


Etherpad
Real-time collaborative text editor with plugin extensibility
Etherpad is a web-based real-time collaborative editor with chat, rich-text formatting, and a plugin framework for customization and integrations.

docker-mailserver
Containerized mail server stack for SMTP and IMAP with anti-spam
Production-ready mail server stack in a Docker container with SMTP, IMAP/POP3, LDAP auth, anti-spam/AV, DKIM/DMARC, and optional OAuth2 support.

Overleaf
Web-based collaborative LaTeX editor
Open-source, web-based LaTeX editor for real-time collaboration, project management, and PDF compilation in the browser.

Postal
Open source mail delivery platform for inbound and outbound email
Postal is an open source mail delivery platform for sending and receiving email, with SMTP support, web-based management, and tools for running your own SendGrid-style se...


Mail-in-a-Box
Turnkey email server with webmail, DNS, TLS, and admin panel
Mail-in-a-Box is a one-click mail server appliance for Ubuntu, bundling SMTP/IMAP, webmail, DNS, TLS automation, backups, and an admin control panel.

Gotify
Self-hosted notification server with REST API and WebSocket delivery
Gotify is a self-hosted notification server that delivers messages in real time via WebSocket, with a REST API, web UI, and optional clients like Android and CLI.

Habitica
Gamified task manager and habit tracker
Habitica is an open-source gamified task manager turning Habits, Dailies, and To-Dos into RPG quests with avatars, gear and social features.

Tinode
Instant messaging server with multi-platform clients and APIs
Tinode is an open source instant messaging platform with a Go backend, web/mobile clients, JSON WebSocket and gRPC APIs, and support for one-to-one and group chat.


Element
Matrix-based secure messaging and collaboration client
Element is a Matrix client for secure team messaging and collaboration, offering end-to-end encrypted chats and calls with interoperability across the Matrix network.


mailcow: dockerized
Docker-based email server suite with a web admin interface
Mailcow is a dockerized mail server suite providing SMTP/IMAP, webmail, anti-spam/anti-virus, and domain/mailbox administration via a unified web UI.

Stalwart Mail Server
All-in-one mail and collaboration server for modern and legacy protocols
All-in-one open-source mail and collaboration server with SMTP, IMAP, JMAP, CalDAV, CardDAV, and WebDAV, plus integrated anti-spam and phishing protection.

Owncast
Self-hosted live video streaming server with built-in chat
Owncast is a self-hosted live streaming server that supports RTMP ingest, HLS playback, and built-in web chat, with optional Fediverse (ActivityPub) integration.

SimpleX Chat
Open-source encrypted messenger with no user identifiers
Open-source, decentralized messaging network built on a Haskell core with Kotlin Multiplatform and native iOS clients; end-to-end encrypted messaging without user IDs.

Screego
Open-source self-hosted screen sharing for developers
Open-source screen sharing server that runs self-hosted; WebRTC-based with TURN server; Docker or single-binary deployment; browser-based.

BigBlueButton
Open-source web conferencing for virtual classrooms
BigBlueButton is an open-source virtual classroom and web conferencing platform with real-time audio/video, screen sharing, whiteboards, breakout rooms, polling, and reco...
Janus WebRTC Server
General-purpose WebRTC media server with a plugin architecture
Janus WebRTC Server is a lightweight, general-purpose WebRTC gateway for building real-time audio/video applications via plugins and a JSON-based API.

ownCloud
Open-source file sync, share and collaboration platform
Open-source platform for secure file sync, sharing, collaboration, calendars and external storage with WebDAV/CalDAV/CardDAV support.

Mumble
Low-latency, high-quality VoIP voice chat client and server
Mumble is an open-source, low-latency VoIP voice chat platform with a desktop client and a self-hosted server for encrypted group communication.