We are working on a headless Linux client that will allow you to stream first pty/terminals, and then windows, into a CoScreen from Linux systems.
It's going to be a very small utility, and we hope to provide access to it by May/June.
This will eventually evolve into a full blown client.
In the meantime we will have a web client which will work on Linux released shortly, it's currently being privately tested within DataDog.