Add Jam to Custom communication systems (#2778)

README.md

@@ -307,6 +307,7 @@ _See also: [Comparison of CalDAV and CardDAV implementations - Wikipedia](https:
 - [GNUnet](https://gnunet.org/) - Free software framework for decentralized, peer-to-peer networking. ([Source Code](https://gnunet.org/git/)) `GPL-3.0` `C`
 - [Gotify](https://gotify.net/) - Self-hosted notification server with Android and CLI clients, similar to PushBullet. ([Source Code](https://github.com/gotify/server), [Clients](https://github.com/gotify/android)) `MIT` `Go`
 - [Hawkpost](https://hawkpost.co) - HawkPost is a web app that lets you create unique links that you can share with a person that desires to send you important information but doesn't know how to encrypt it. The message is encrypted in their browser and sent to your email address. ([Source Code](https://github.com/whitesmith/hawkpost)) `MIT` `Python`
+- [Jam](https://jamshelf.com/) - Jam is an open source alternative to Clubhouse: private audio chat rooms to talk to friends and family. ([Demo](https://jam.systems/), [Source Code](https://github.com/jam-systems/jam)) `AGPL-3.0` `Docker/Node.js`
 - [Jami](https://jami.net/) - Free and universal communication platform which preserves the user's privacy and freedoms (formerly GNU Ring). ([Source Code](https://git.ring.cx/savoirfairelinux/ring-project)) `GPL-3.0` `C++`
 - [Jitsi Meet](https://jitsi.org/Projects/JitsiMeet) - Jitsi Meet is an OpenSource (MIT) WebRTC Javascript application that uses Jitsi Videobridge to provide high quality, scalable video conferences. ([Source Code](https://github.com/jitsi/jitsi-meet)) `MIT` `Javascript`
 - [Jitsi Video Bridge](https://jitsi.org/Projects/JitsiVideobridge) - WebRTC compatible Selective Forwarding Unit (SFU) that allows for multiuser video communication. ([Source Code](https://github.com/jitsi/jitsi-videobridge)) `Apache-2.0` `Java`