Best Self-hosted Communication & Collaboration tools in 2026
168 self-hosted open source alternatives in this category
168 services found
Kiwi IRC
Web-based IRC client with embeddable widgets and theming
Kiwi IRC is a web-based IRC client you can self-host as static files, with multi-network support, runtime JSON configuration, themes, plugins, and embeddable web widgets.
Glowing Bear
Web frontend for WeeChat using the relay over WebSockets
Glowing Bear is a browser-based WeeChat client that connects to WeeChat via the relay plugin, providing a modern interface for IRC from any device.
Hauk
Open-source self-hosted real-time location sharing service
Open-source self-hosted real-time location sharing backend with in-memory storage, temporary share links, a Docker image and companion mobile clients.
OpenTrashmail
Self-hosted disposable email inbox with web UI, API, RSS, webhooks
OpenTrashmail is a standalone disposable email (“trashmail”) service with its own SMTP server, offering a web UI plus JSON API, RSS feeds, and webhooks for received mail.
Hyvor Relay
Open-source, self-hosted Email API for developers
AGPL-3.0 open-source email API for developers that can be self-hosted; supports SMTP sending, webhooks, DNS automation, observability, multi-tenancy, and project isolation.
Quassel IRC
Distributed, cross-platform IRC client with detachable core
Modern, cross-platform IRC client with a detachable core for persistent connections, multi-client access, and searchable chat backlogs.
DavMail
Exchange and Microsoft 365 gateway for standard mail and PIM protocols
DavMail is a Java gateway that lets standard clients use IMAP/POP/SMTP, CalDAV, CardDAV, and LDAP with Microsoft Exchange and Microsoft 365 via OWA/EWS.
Davis
CalDAV/CardDAV/WebDAV server with a Symfony-based admin interface
Davis is a sabre/dav-based CalDAV/CardDAV/WebDAV server with a modern Symfony 7 admin dashboard for managing users, calendars, sharing, and address books.
Nortix Mail
Disposable email server with a simple self-hosted setup
Self-hosted disposable email server for creating temporary addresses to reduce spam and protect privacy, with an optional TLS setup and a web UI.
Nextcloud Tasks
Task management app for Nextcloud with CalDAV sync
Nextcloud Tasks provides a web-based to-do list with priorities, due dates, subtasks, and CalDAV synchronization with mobile and desktop task clients.
Apache OpenMeetings
Web conferencing with video, chat, whiteboard, and collaboration
Apache OpenMeetings is a web conferencing and collaboration platform with video meetings, chat, whiteboards, screen sharing, recording, file sharing, and user/room management.
Scribble.rs
Privacy-focused multiplayer pictionary drawing and guessing game
Self-hosted, privacy-respecting pictionary game (skribbl.io alternative) with real-time drawing, guessing, and multiplayer lobbies—no accounts or ads required.
Cyrus IMAP
Email, contacts, and calendar server with IMAP and JMAP
Cyrus IMAP is a secure, scalable mail server providing IMAP/JMAP email plus CalDAV/CardDAV contacts and calendars, with ACLs, quotas, search, and replication.
Manage My Damn Life
Self-hosted web front end for CalDAV calendars and tasks
Self-hosted Next.js React CalDAV client for managing VTODO tasks and VEVENT calendars with multi-account, list/Gantt/calendar views and filters.
Xandikos
CalDAV/CardDAV server that stores data in a Git repository
Lightweight CalDAV/CardDAV server implemented in Python that stores calendars and contacts in a Git-backed hierarchy with history and sync support.
Vocard
Customizable Discord music bot with Lavalink playback
Lightweight, customizable Discord music bot in Python. Supports YouTube, SoundCloud, Spotify, Twitch, Lavalink playback, playlists, lyrics, slash commands and Docker.
ngIRCd
Lightweight, portable IRC server for small or private networks
ngIRCd is a free, portable and lightweight IRC server for small/private networks, supporting IPv6, TLS, server linking, and optional PAM authentication.
plugNmeet
Self-hosted WebRTC video conferencing with AI meeting agent
Open-source, self-hosted web conferencing platform built on LiveKit and Go, offering scalable WebRTC meetings, recordings, broadcasting, collaboration tools, and AI meeting intelligence.
Hitobito
Open-source platform for managing memberships, events and organizations
Open-source web application for complex organization hierarchies: members, events, courses, mailings and payments. Plugin-based, Rails-backed, community-driven.
Nextcloud Office
Collaborative online office suite integrated into Nextcloud
Self-hosted collaborative office suite for Nextcloud providing real-time editing, high-fidelity rendering and support for DOCX, XLSX, PPTX and ODF formats.
Snikket
Open-source XMPP messaging server with encrypted chat and WebRTC
Self-hosted, open-source XMPP-based messaging server providing end-to-end encryption, multi-device sync, federation, secure backups, and integrated WebRTC audio/video calling.
SyncTube
Synchronized web app for shared video playback and chat
Lightweight web application for synchronized video playback with chat, leader-controlled playback, subtitle/audio track support and Docker deployment.
Tigase XMPP Server
Modular, high-performance XMPP/Jabber server in Java
Scalable, modular XMPP/Jabber server written in Java supporting TCP, BOSH, WebSockets, federation, components, HTTP API and push notifications.
Piler
Open-source email archiving and eDiscovery platform
Scalable email archiving solution with tamper-evident retention, full-text search, legal hold, deduplication and access controls for compliance.
positive-intentions Chat
Browser-first decentralized chat with end-to-end encryption
Decentralized, browser-first chat focused on privacy and peer-to-peer interactions. Supports end-to-end encryption, WebRTC file sharing, voice/video calls, mixed-reality spaces and a webtop environment.
Sympa
Open-source mailing list management software
Open-source mailing list manager for automating subscriptions, moderation, archives and message distribution with web, CLI and SOAP interfaces for large lists.
EGroupware
Open-source web-based groupware for calendars, mail, files and projects
Open-source, browser-based groupware providing calendar, email, file manager, CRM, projects, Collabora Online integration and SSO support.
Spacepad
Privacy-focused room display and booking system for workplaces
Self-hostable room display app for tablets that shows real-time room availability, integrates with Microsoft 365, Google Workspace and CalDAV, and supports on-device booking.
Group-Office
Enterprise groupware and CRM with calendars, files and email
PHP-based groupware and CRM for teams: calendars, contacts, email, file management, projects and CRM with CalDAV/CardDAV/IMAP support and extensible modules.
Tracim
Modular team collaboration platform for files, chat, and documentation
Tracim is an open-source collaboration suite offering threaded conversations, file sharing with versioning, collaborative pages, tasks and workspace organization.