Tools

The Secure CommsOS™ for mission-critical operations

a self-hosted server tracking what you read/watch/listen/play, powering a global distributed community federating via ActivityPub and (a bit of) ATProto.

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

Federated single-user microblogging software

Webmail built for the 21st Century. A modern, self-hosted email client for Stalwart Mail Server powered by the JMAP protocol. Email, calendar, contacts and files. Fast, private, and open source.

Notifuse is an open-source & modern emailing platform

The software powering Stoat

FreeScout — Free self-hosted help desk & shared mailbox (Zendesk / Help Scout alternative)

Nextcloud Talk – chat, video & audio calls for Nextcloud

A federated, text-based social network with a Gemini frontend

Open source video conferencing app powered by LiveKit.

Your self-hosted, globally interconnected microblogging community

Modern, open source, self-hosted customer support desk. Single binary app.

mailcow: dockerized - + =

Fast, highly extensible, and event driven SMTP server.

All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).

A completely free and open interplanetary-microblogging platform

Lightweight, self-hosted, open-source chat server with voice, video, text, and screen sharing. Built for small groups who want privacy, simplicity, and full control over their data.

Fully-featured Matrix client for Web, iOS & Android.

ActivityPub (https://www.w3.org/TR/activitypub/) server for individual users and small groups.

The Roundcube Webmail suite

Typebot is a powerful chatbot builder that you can self-host.

Open-source live-chat, email support, omni-channel desk. An alternative to Intercom, Zendesk, Salesforce Service Cloud etc.

Insular email distribution - mail server as Docker images

Real time collaboration (RTC) server.

A complete web conferencing system for virtual classes and more!

Mail-Archiver is a web application for archiving, searching, and exporting emails from multiple accounts. Featuring folder sync, attachment support, mailbox migration and a dashboard.

A simple CalDAV (calendar) and CardDAV (contact) server.

A fully featured open source mail delivery platform for incoming & outgoing e-mail

Open Source Newsletter Tool.

Micro-blog tool offering built-in syntax highlighting, mobile publishing and more (alternative to Twitter, Bluesky)

Web-based XMPP/Jabber chat written in JavaScript

SOGo offers multiple ways to access the calendaring and messaging data. CalDAV, CardDAV, GroupDAV, as well as ActiveSync, including native Outlook compatibility and Web interface.

Preserve your emails with this open-source self-hostable email archive! This repository is a read-only mirror, please go to the gitlab repo at https://gitlab.com/Dacid99/eonvelope to contribute code.

High-performance and feature-rich chat server for Matrix, and the successor to conduwuit (fork of Conduit).

Scalable no-SPOF IMAP/POP3 mail server.

Mail hosting and management platform including a modern and simplified web user interface.

Live Support chat for your website.

With a fresh new take on traditional bulletin board forum software, Storyden is a modern, secure and extensible platform for building communities.

Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.

Synapse: Matrix homeserver written in Python/Twisted + Rust

Mumble is an open-source, low-latency, high quality voice chat software.

Friendica Communications Platform

All-in-one mail server that implements SMTP (both MTA and MX) and IMAP. Replaces Postfix, Dovecot, OpenDKIM, OpenSPF, OpenDMARC with single daemon.

Mobile messaging platform with a focus on performance and scalability.

Dovecot mail server

Cypht: Lightweight Open Source webmail aggregator [PHP, JS]. Supports IMAP/SMTP, JMAP and EWS (Exchange Web Services)

Next-Gen self-hosted chat server and clients.

Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.

Open-Source Email API for Developers. Self-hosted Alternative to SES, Mailgun, SendGrid.