Tools

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

Nextcloud Talk – chat, video & audio calls for Nextcloud

The software powering Stoat

Federated single-user microblogging software

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

The Secure CommsOS™ for mission-critical operations

Insular email distribution - mail server as Docker images

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

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

Synapse: Matrix homeserver written in Python/Twisted + Rust

Email (IMAP/POP3), contacts and calendar server.

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.

Open source video conferencing app powered by LiveKit.

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

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.

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

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

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

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

Notifuse is an open-source & modern emailing platform

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

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

Fast, highly extensible, and event driven SMTP server.

A modern IRC server (daemon/ircd) written in Go.

Scalable no-SPOF IMAP/POP3 mail server.

Social reading and reviewing, decentralized with ActivityPub

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

The Roundcube Webmail suite

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

mailcow: dockerized - + =

Live Support chat for your website.

A complete web conferencing system for virtual classes and more!

An open-source platform for legally compliant email archiving.

Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots.

Your self-hosted, globally interconnected microblogging community

Next-Gen self-hosted chat server and clients.

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

Movim - Decentralized social platform

Real time collaboration (RTC) server.

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.

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

POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.

Secure direct video group chat

Mobile messaging platform with a focus on performance and scalability.

SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps !

Baïkal is a Calendar+Contacts server

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.

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

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

Web-based XMPP/Jabber chat written in JavaScript