BuiltWith - Find out the technology behind websites
Agoda YCS for hotels only - Agoda YCS for hotels only is a traveling app that comes up with features to help users in minimizing their hotel booking efforts by providing them with a large number of choices all around the globe.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Gopher - Better hotel deals automatically, every time + cash back
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
HotelTonight Escape - The best getaway deals for tonight (or the weekend)