On Mixer, when you visit a channel page you can send messages to the channel that all the viewers and the channel owner can read. With FTL this allows a streamer to react in near real-time to chat messages as they come in.
Chat also fully supports developers, you can use our Chat APIs to get in on this action and contribute in a ton of meaningful ways to the chat experience.
We currently have one chat tutorial, it shows you how to setup a basic chat bot and can be found here. Try it out. If you'd like to know how to do other things with out Chat API then please open an issue and let us know!
If you'd like to jump in and get started you can also checkout our Chat Reference material which details how you can write your own SDK implementation.