Xtralogic RDP Client is described as 'Xtralogic® RDP Client for Chrome enables you to connect to your Windows computers across the Internet from any computer which runs Chrome browser or Chrome OS'. There are three alternatives to Xtralogic RDP Client for a variety of platforms, including iPad, iPhone, Linux, Mac and Windows. The best alternative is Chrome Remote Desktop, which is free. Other great apps like Xtralogic RDP Client are Remmina (Free, Open Source) and iRDP (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.
iRDP is a 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.