mRemoteNG is a great RDP management program and best of all it is open-source. Some months ago I need a replacement for the old freeware version of RoyalTS (code4ward.com) and mRemoteNG looked promising. The only thing it lacked was a way to import a pre-configured list of hosts.
Building a program to import a CSV-style listing was a challenge. I am not a programmer, but I do have years of experience working with Winbatch (winbatch.com). It took hours and hours, but I have a working program that will take a specifically formatted CSV list and output a formatted XML file that mRemoteNG will read. Testing is ongoing. Stay-tuned for more.