Best Self-hosted Communication & Collaboration tools in 2026
168 self-hosted open source alternatives in this category
168 services found
CryptPad
End-to-end encrypted collaborative office and document suite
CryptPad is an end-to-end encrypted collaboration suite with real-time editors, file storage, and sharing, designed to keep document contents private from servers and admins.
Mailu
Docker-based mail server with webmail and admin interface
Mailu is a full-featured mail server distributed as Docker images, providing SMTP/IMAP/POP3, webmail, administration UI, and built-in security and anti-spam features.
Roundcube
Browser-based IMAP webmail client with extensible plugins and skins
Open source webmail client for IMAP with address book, search, folders, and a customizable UI via plugins and skins.
SimpleLogin
Open-source email aliasing and forwarding service
SimpleLogin is an open-source email alias service that lets you create aliases to protect your real inbox, forward mail, and reply or send from aliases using custom domains.
ONLYOFFICE Docs
Collaborative online editors for documents, spreadsheets, and presentations
Self-hostable online office suite for viewing and collaboratively editing documents, spreadsheets, presentations, PDFs, and forms with strong OOXML compatibility.
ejabberd
Scalable real-time messaging server for XMPP, MQTT, and SIP
ejabberd is an Erlang/OTP-based messaging server providing XMPP chat and presence, MQTT broker capabilities for IoT, and SIP services for real-time communications.
Spacebar
Discord-compatible self-hosted chat with voice and video
Spacebar is an open source, self-hostable Discord-compatible communication platform with text chat, voice, and video, designed to work with existing clients and bots.
The Lounge
Modern, responsive, self-hosted web IRC client
Self-hosted web-based IRC client with multi-user support, persistent connections, and a responsive UI for desktop and mobile.
Maddy Mail Server
Composable all-in-one SMTP/IMAP mail server with security features
Go-based, modular mail server implementing SMTP/LMTP/IMAP with built-in DKIM/SPF/DMARC, storage backends (SQLite/Postgres/S3), Prometheus metrics and Docker support.
Mox
Modern, secure, all-in-one mail server for self-hosted email
All-in-one secure mail server with SMTP, IMAP, webmail, automatic TLS (ACME), and built-in SPF/DKIM/DMARC plus junk filtering for low-maintenance domains.
Haraka
High-performance, extensible SMTP server built on Node.js
Haraka is a fast, event-driven SMTP server for receiving, filtering, and relaying email, featuring a modular plugin architecture for customization at scale.
FreeSWITCH
Software-defined telecom stack for VoIP, SIP, and real-time media
FreeSWITCH is an open-source software-defined telecom stack for building VoIP and real-time communication services with SIP and WebRTC support.
Colanode
Local-first collaboration workspace for chat, docs, and databases
Open-source, local-first Slack and Notion alternative combining team chat, rich docs, databases, and file management with offline-first sync and self-hosting.
Radicale
CalDAV and CardDAV server for calendars, tasks, and contacts
Lightweight CalDAV/CardDAV server for syncing calendars, to-dos, and contacts with many clients, storing data on the filesystem and supporting auth and TLS.
AnonAddy
Anonymous email aliasing and forwarding with GPG support
Open-source anonymous email forwarding that creates and manages aliases, supports custom domains, encrypted forwarding, and self-hosting via Postfix and MariaDB.
Synapse
Matrix homeserver for federated, secure real-time communication
Synapse is a Matrix homeserver implementation for running federated, secure real-time chat and collaboration on your own infrastructure.
Tailchat
Extensible team chat platform with plugins, bots, and roles
Tailchat is an open source team chat and collaboration platform with a strong plugin system, bot integrations, multi-group workspaces, and RBAC permissions.
Modoboa
Mail hosting and management platform with web UI and webmail
Modoboa is an open source mail server management platform with a modern web UI, integrating Postfix and Dovecot with admin tools, webmail, calendar, and address book.
Asterisk
Open-source telephony engine and PBX framework
Open-source PBX and telephony toolkit for building communications applications; modular C-based engine with SIP, WebRTC, RTP, ARI/AMI APIs and hardware support.
Ergo
Modern IRC server with integrated services and history
Ergo is a modern IRC server (ircd) written in Go, with integrated account management, history storage, bouncer-like features, and strong IRCv3 support.
Converse.js
Web-based XMPP/Jabber chat client for browsers
Converse.js is an open-source, client-side web XMPP/Jabber chat app that can run standalone or be embedded into sites, with group chat and OMEMO encryption.
Baïkal
Lightweight CalDAV and CardDAV server for calendars and contacts
Baïkal is a lightweight CalDAV/CardDAV server with a web admin UI for managing users, calendars, and address books, backed by MySQL or SQLite.
Stoat
Open-source, self-hosted chat and community platform (formerly Revolt)
Stoat is an open-source, self-hostable chat platform for communities and teams, offering text channels, permissions, moderation tools, and a web app.
Jitsi Videobridge
Open-source WebRTC Selective Forwarding Unit (SFU)
An open-source WebRTC SFU that routes media for scalable multiparty video conferencing; supports Colibri XMPP/REST control, DTLS/SRTP, and Prometheus metrics.
Openfire
Real-time collaboration server for XMPP (Jabber) messaging
Openfire is an open source XMPP (Jabber) server for real-time messaging and collaboration, with a web admin console and a plugin ecosystem.
AliasVault
End-to-end encrypted password manager with built-in email aliasing
Privacy-first, end-to-end encrypted password and email alias manager with passkeys, TOTP, apps and extensions, plus a built-in email server for self-hosting.
YunoHost
Debian-based server OS and web control panel for self-hosted apps
Open-source Debian-based OS and control panel that simplifies installing, managing and securing web apps, mail and services via a web admin and app catalog.
NextcloudPi
Preconfigured Nextcloud image and management panel for SBCs
Prebuilt Nextcloud appliance and management tools for Raspberry Pi, Odroid, VMs and LXC; includes Apache, PHP, MariaDB, Redis, web panel and backup utilities.
Kamailio
High-performance SIP server for VoIP and real-time communications
Kamailio is an open source SIP signaling server for scalable VoIP and real-time communication platforms, supporting routing, load balancing, WebRTC, and IMS/VoLTE.
Tox
Peer-to-peer encrypted instant messaging, calls, and file sharing
Tox is a decentralized, peer-to-peer communication system for encrypted messaging, voice/video calls, screen sharing, and file transfers without central servers.