BuiltWith - Find out the technology behind websites
Competera - Competera is a price tracking tool for performance-oriented eCommerce retail and brands of all sizes worldwide.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
PriceComparator - ALL in 1 : Price, Product, Promotion, Social Media and Place Monitoring. Explore Big Data easily to improve your business. Usefull for Retailers and Suppliers. Try it, win a lot, you'll love it !
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
Prisync - Prisync is a competitor price tracking and monitoring software for all sizes of e-commerce companies worldwide.