iRDP is described as 'remote desktop client for iPhone and iPad supporting both RDP and VNC. It features a full PC keyboard, 8 and 16 bit color depth and for RDP, it supports and gamepad and configurable screen size' and is an app in the Network & Admin category. There are three alternatives to iRDP for a variety of platforms, including Chrome OS, Google Chrome, Linux, Mac and Windows. The best alternative is Chrome Remote Desktop, which is free. Other great apps like iRDP are Remmina (Free, Open Source) and Xtralogic RDP Client (Free).
Remmina is a remote desktop client written in GTK+. Remmina primarily targets system administrators and travelers that need to work with computers remotely in front of either large monitors or tiny netbooks.