Best Self-hosted Communication & Collaboration tools in 2026

Scalable email archiving solution with tamper-evident retention, full-text search, legal hold, deduplication and access controls for compliance.

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MailStore Server+1

Community-focused server for private photo/video backup, albums, chat and audio/video calls with mobile app support and S3-compatible storage.

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Google Photos+10

An IRC network implementation in Go that uses the Raft consensus algorithm to eliminate netsplits and provide transparent client failover via a bridge.

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IRCCloud+3

Create, share and combine structured tables and views inside Nextcloud. Supports templates, CSV/spreadsheet import, custom columns, filtered views and an OpenAPI-backed A...

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Google Sheets+8

Open-source, modular SIP server (proxy, presence, conference, B2BUA) with push gateway, ICE/STUN/TURN, MySQL/SQLite support; optimized for mobile and embedded systems.

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3CX+11

Open-source event listing and aggregator built on Laravel. Provides iCal feeds, tags, RSVP, photos, and multiple authentication methods for community and organization eve...

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Meetup+6

SAMA is a Node.js-based open-source chat server using uWebSockets.js, MongoDB and Redis, providing WebSocket/HTTP APIs, E2EE, clustering, and web/mobile clients.

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Sendbird+19

Atria is an AGPL-3.0 open-source platform for managing hybrid events, sessions, sponsors, and real-time attendee networking with chat and discovery tools.

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Whova+16

Open-source PWA that generates live captions and transcripts in the browser; supports broadcasts, OBS/vMix integration, and optional Azure AI captions.

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Rev+6

Integrated installer and platform for home infrastructure. Provides VPN relay for NAT traversal, preconfigured email, automatic HTTPS, reverse proxy, and a web management...

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Cloudron+19

Python-based Discord bot that lets authorized users list and control Docker containers and images via Discord commands, using the host Docker socket.

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Carl-bot

Open-source PHP groupware providing CalDAV/CardDAV, ActiveSync, email client, CRM, tasks, file manager and Docker images for on-premise collaboration.

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Microsoft Exchange Online+19

Simple NixOS Mailserver provides NixOS modules to deploy a full email server with SMTP/IMAP, spam filtering, DKIM/DMARC/SPF, and TLS automation.

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Microsoft Exchange Online+14

Open-source, API-first platform for carrier-grade IP communications: VoIP, WebRTC, messaging, conferencing and programmable telephony microservices.

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3CX+19

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 Ope...

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Postfix+12

Collabora Online Development Edition (CODE) provides a self-hosted LibreOffice-based online editor for documents, spreadsheets and presentations for testing or small team...

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Collabora Online+13

Exim is an open source SMTP message transfer agent (MTA) for Unix-like systems, offering flexible mail routing and extensive controls for handling inbound email.

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Amazon Simple Email Service (Amazon SES)+10

Postorius is a Django web UI for managing GNU Mailman 3 mailing lists, covering list administration and user subscription preferences.

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Groups.io

WikiSuite is an integrated open source suite combining wiki/groupware, chat and conferencing, webmail, search, and infrastructure management for organizations.

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Atlassian Confluence+19

HyperKitty is a web interface and archiver for Mailman 3 mailing lists, providing searchable list archives, thread views, user profiles, and email interaction features.

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Cryoserver Email Archive

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.

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Element Matrix (Hosted)+13

chasquid is a minimalist SMTP server (MTA) for individuals and small groups, focused on secure defaults, easy configuration, and straightforward operation.

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Postfix+11

Inboxen provides unlimited unique email inboxes to protect your primary address from spam, sign-ups, and tracking while keeping your real inbox clean.

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Mailinator+3

Self-hosted platform for capturing SIP/RTP traffic, analyzing call flows, and monitoring VoIP quality metrics with dashboards and alerts.

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VoIPmonitor Cloud+4

Schleuder is an OpenPGP-enabled mailing list manager that encrypts list mail and supports remailing, allowing subscribers and non-subscribers to exchange secure emails vi...

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Groups.io+3

Libervia is a modular XMPP-based communication suite offering chat, microblogging, file sharing, and other social features across web, desktop, and CLI interfaces.

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Element Matrix (Hosted)+19

Lightweight PHP webmail client for IMAP/SMTP servers, offering a simple interface, plugin extensibility, and broad compatibility with standard mail backends.

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Gmail+10

u-wave is a self-hosted social music room with DJ-style queueing, chat, and browser-based playback for listening together in real time.

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Plug.dj+3

GNU Mailman is a mailing list manager for email discussion lists and newsletters, with web-based administration, archives, moderation tools, and bounce handling.

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Groups.io+4

Lightweight SMTP server written in Go that receives and sends email via a single JSON config and executable hooks; supports per-user DKIM and TLS.

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Amazon Simple Email Service (Amazon SES)+11