Matrix.org is a growing ecosystem for open, decentralised chat, VoIP and IoT communication.
The Matrix project defines an open baseline standard of RESTful HTTP APIs alongside open source, Apache-licensed reference implementations of servers, clients and services. It can be used to synchronise real-time data between multiple destinations, for example for IoT-style services - and of course for instant messaging, IRC-like chat rooms, and voice and video calls/conferencing. More Info »
It is based on : http://webrtc.org
It can be hosted on the top of IPFS.io
or it can be hosted on Synapse : https://github.com/matrix-org/synapse
Source code : https://github.com/matrix-org/matrix.to
Instance explorer : https://matrix.to