and an official Twitch extension (Overlay) with Chroma RGB - dashboard.twitch.tv/extensions/0bjhmu40mf9oxnn604lpcmbe8iczen
I put together a setup video for how to get started.
I've seen a bunch of users on Twitch only adding the overlay, while you need to broadcast data in order to show on the viewers overlay and hardware. If you see a streamer not broadcasting Chroma RGB while they have the overlay installed, let them know in chat (if that game has it available).
With the latest update on Synapse, hardware is not required for the streamer or viewer.
Feel free to post feedback for any issues you might run into or features that you might want to see.
Also here is a code snippet for showing streams that are using the Razer Chroma RGB for Streamers overlay. Feel free to stylize and include this snippet on your own sites.