This year we are going to release Agent (and possibly Host) for MacOSX, which may also mean Agent/Host for Linux.
As for a Host for mobile devices while we do have these on our wishlist their priority is much lower and it's unlikely that we will be able to release them any time soon.
We still have the mobile Host for iOS/Android in our wishlist, however, right now our priority is releasing a stable version of Remote Utilities for Mac/Linux. Unfortunately, we can’t provide any specific ETA for the mobile Host.
This is to inform you that we’ve released the first beta version of Remote Utilities Host for macOS. Feel free to download and test it — we appreciate your feedback.