Unfortunately, we don't provide our software for testing privately. However, we will provide a beta version of Host/Agent for Mac/Linux for open testing - it will be publicly available on our website for everyone to download, test and provide feedback (pretty much like with Viewer for Linux/Mac).
We understand your frustration and apologize for keeping you waiting for so long. However, I can assure you that we definitely will release Host/Agent for Mac/Linux and it is currently the biggest priority for our development department. We'll do our best to make it available as soon as possible. Thank you for your patience.
Please note that Host for Mac/Linux is already in development and we plan to release it in the nearest time as it's our biggest priority at the moment. As for the Raspberry PI - we do have plans for releasing Viewer (and Host/Agent subsequently) for ARM Mac/Linux OSs as well sometime later.
Honestly, when will the developer team start taking care of it? I find it dishonest to go around making excuses and lying to their customers.
We apologize for keeping everyone waiting for so long. We're doing our best (especially our developers) to make the promised releases available as soon as we can. However, please note that we're always transparent with our ETAs (even if we can't provide one for some features). Unfortunately, some delays with the release have occurred due to the fact that it was decided to use more advanced framework, which has made the development process longer, but will ultimately make the product better and more reliable.