Session is an end-to-end encrypted messenger that removes sensitive metadata collection, and is designed for people who want privacy and freedom from any forms of surveillance.

Dino is a modern open-source chat client for the desktop. It focuses on providing a clean and reliable Jabber/XMPP experience while having your privacy in mind.

Manage conversations, build relationships and delight your customers, all from one place. Opensource alternative to Intercom, Zendesk, Drift, Crisp etc

The two developers Toby Zerner and Franz Liedke have revisited the forum software by building Flarum. It's fast, open source and comes with a fresh design.