Qabel is a software platform that allows users across applications to en-crypt all digital communication always and easily end-to-end. In many cases, users can continue using their standard programs.
"Matrix is an open standard for interoperable, decentralised, real-time communication over IP. It can be used to power Instant Messaging, VoIP/WebRTC signalling, Internet of Things communication - or anywhere you need a standard HTTP API for publishing and subscribing to data whilst tracking the conversation history."