Mastodon
Federated microblogging server.
Discover and compare Communication Platforms tools in Communication.
Federated microblogging server.
Advanced forum / community solution based on Ruby and JS.
Notification infrastructure for developers.
Customer communication platform (alternative to Intercom and Zendesk).
Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.
High performance, self-hosted newsletter and mailing list manager with a modern dashboard.
Knowledge-based community software. You can use it to quickly build your Q&A community for product technical support, customer support, user communication, and more.
Supports real-time sharing of audio, video, slides (with whiteboard controls), chat, and the screen. Instructors can engage remote students with polling, emojis, and breakout rooms.
Language-agnostic real-time messaging (Websocket or SockJS) server.
Distributed social networking server.
Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. Only configuration files, no SQL database.
Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again.
Notification server with Android and CLI clients (alternative to PushBullet).
General-purpose, lightweight, minimalist WebRTC Server.
Link aggregator for the fediverse (alternative to Reddit).
Turns any Ubuntu server into a fully functional mail server with one command.
Mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration.
Simple yet full-featured mail server as a set of Docker images.
Marketing automation software (email, social and more).
Decentralized app-like microblogging server/SNS for the Fediverse, using the ActivityPub protocol like GNU social and Mastodon.
Forum software built for the modern web.
Ethical photo sharing platform, powered by ActivityPub federation (alternative to Instagram).
Complete and fully featured mail server for use by websites & web servers.
Browser-based IMAP client with an application-like user interface.