Google Chrome Remote Desktop - free

Google is now offering a free remote desktop service. It's super easy to setup and... free. All you need to do is install it on your RGP machine(s) and then on whatever computer you want to access them from.

If you do use this tool, I recommend enable 2-factor authentication on your Google account for proper security.

I've tested it and it works GREAT.

https://support.google.com/chrome/answer/1649523?hl=en