AFAIK, FreeRDP is largely what is underneath most of the iOS/Android/etc RDP clients. Largely because rdesktop which preceded it is GPL licensed. Which focused

AFAIK, FreeRDP is largely what is underneath most of the iOS/Android/etc RDP clients. Largely because rdesktop which preceded it is GPL licensed. Which focused a lot of commercial development to create an alternative, and hence freeRDP. Which also did a better job of not being as tightly integrated with X11 as rdesktop is/was because a lot of the windows GDI API has corresponding X11 functionality, so if the function is an Xored Blit operation, or a hatched pen fill, then rdesktop just offloadeds to X11 and presumably the graphics card rather than being software rendered.