Best Self-hosted Communication & Collaboration tools in 2026
168 self-hosted open source alternatives in this category
168 services found
Postfix
Secure and efficient SMTP mail transfer agent (MTA)
Postfix is a fast, secure, and easy-to-administer SMTP server for sending and routing email on Unix-like systems, commonly used as an MTA or mail relay.
Postorius
Django-based web interface for GNU Mailman 3 mailing lists
Postorius is a Django web UI for managing GNU Mailman 3 mailing lists, covering list administration and user subscription preferences.
Prosody IM
Lightweight and extensible XMPP (Jabber) communication server
Prosody IM is a modern, resource-efficient XMPP (Jabber) server written in Lua, designed to be easy to configure and extend for private messaging and federation.
SIP3
SIP and VoIP QoS monitoring with call flow analytics
Self-hosted platform for capturing SIP/RTP traffic, analyzing call flows, and monitoring VoIP quality metrics with dashboards and alerts.
Salut à Toi
Multi-purpose, federated communication platform based on XMPP
Salut à Toi (SàT) is a self-hostable, XMPP-based communication suite with web, desktop, and CLI frontends, supporting chat and collaborative features via plugins.
Schleuder
OpenPGP-enabled mailing list manager with remailing
Schleuder is an OpenPGP-enabled mailing list manager that encrypts list mail and supports remailing, allowing subscribers and non-subscribers to exchange secure emails via the list.
Sendmail Open Source
Open source subset of Sendmail Sentrion for enterprise email environments.
Open Source Sendmail provides a subset of Proofpoint's Sendmail Sentrion MTA for large-scale mail deployments; current release is 8.16.1 with a PGP-signed tarball and OpenDKIM integration.
Simple NixOS Mailserver
NixOS module for running a complete email server stack
Simple NixOS Mailserver provides NixOS modules to deploy a full email server with SMTP/IMAP, spam filtering, DKIM/DMARC/SPF, and TLS automation.
SquirrelMail
Browser-based IMAP webmail client written in PHP
Lightweight PHP webmail client for IMAP/SMTP servers, offering a simple interface, plugin extensibility, and broad compatibility with standard mail backends.
Stackspin
Open source collaboration suite with SSO and admin dashboard
Stackspin is an open source platform that bundles common team collaboration apps with single sign-on, centralized user management, backups, and monitoring for admins.
Wazo Platform
Open-source programmable IP telecommunication platform
Open-source, API-first platform for carrier-grade IP communications: VoIP, WebRTC, messaging, conferencing and programmable telephony microservices.
WikiSuite
Integrated suite for knowledge management, collaboration, and IT admin
WikiSuite is an integrated open source suite combining wiki/groupware, chat and conferencing, webmail, search, and infrastructure management for organizations.
Yeti-Switch
Carrier-grade Class 4/5 VoIP softswitch and SBC
Carrier-grade VoIP softswitch/SBC for routing, billing, and managing SIP traffic, with LCR, fraud control, and high-availability deployment options.
Zimbra Collaboration
Enterprise email, calendar, contacts, and collaboration suite
Self-hosted enterprise collaboration suite providing email, webmail, calendaring, contacts, and administration for organizations.
b1gMail
Web-based email and collaboration suite for running hosted email services
Open-source webmail and groupware offering email, contacts, calendar, cloud drive, tasks, notes and an admin control panel for multi-tenant email services.
chasquid
Simple and secure SMTP mail transfer agent (MTA)
chasquid is a minimalist SMTP server (MTA) for individuals and small groups, focused on secure defaults, easy configuration, and straightforward operation.
u-wave
Self-hosted collaborative music listening with a shared queue
u-wave is a self-hosted social music room with DJ-style queueing, chat, and browser-based playback for listening together in real time.
üWave
Collaborative music listening with real-time DJ queues
Self-hosted collaborative music room app with DJ queues, real-time chat, and YouTube/SoundCloud-style playback for shared listening sessions.