Pleroma

Federated microblogging server with Mastodon, GNU social, and ActivityPub compatibility.

Full featured live chat, help center and CRM as an alternative to Intercom & Drift, Crisp and others.

Privacy-friendly and customizable Disqus (comment system) alternate.

Distributed social networking server.

Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground.

Social Communication Server.