I am also highly interested in this! The lack of a server for Linux is holding me back a bit and looking for alternatives as well. So I really hope this is something that could be realized this year, but I am not confident it will since this feature request is open for over 3 years now ... I do like your product though.
We already have RU Server for Linux currently in development and we definitely plan to release it in the near future, perhaps, after stable versions of Viewer and Host for Mac/Linux are available. Unfortunately, we can't provide any specific ETA on this yet, however we will let our users know once it's available for testing.
