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Piler

Feature-rich email archiving solution.

PixelFed

Pixelfed is an open-source, federated platform alternate to Instagram.

Pleroma

Federated microblogging server, Mastodon, GNU social, & ActivityPub compatible.

Plunk

The Open-Source Email Platform

Postal

A complete and fully featured mail server for use by websites & web servers.

Fast, easy to administer, and secure Sendmail replacement.

Web user interface to access GNU Mailman.

Feature-rich and easy to configure XMPP server.

PushBits

Self-hosted notification server for relaying push notifications via Matrix, similar to PushBullet and Gotify.

Quassel IRC

Distributed IRC client, meaning that one (or multiple) client(s) can attach to and detach from a central core.

Redlib

An alternative private front-end to Reddit, with its origins in Libreddit.

RetroShare

Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.

Robust IRC

RobustIRC is IRC without netsplits. Distributed IRC server, based on RobustSession protocol.

Rocket.Chat

Teamchat solution similar to Gitter.im or Slack.

Roundcube

Browser-based IMAP client with an application-like user interface.

Routr

A lightweight sip proxy, location server, and registrar for a reliable and scalable SIP infrastructure.

SAMA

Next-Gen self-hosted chat server and clients.

VoIP troubleshooting and monitoring platform.

SIPCAPTURE Homer

Troubleshooting and monitoring VoIP calls.

Multipurpose, multi frontend, libre and decentralized communication tool.

GPG-enabled mailing list manager with resending-capabilities.

Scoold

Stack Overflow in a JAR. An enterprise-ready Q&A platform with full-text search, SAML, LDAP integration and social login support.

Screego

Screego is a simple tool to quickly share your screen to one or multiple people via web browser.

Message transfer agent (MTA).