Geckoboard - Get to know Geckoboard: Instant access to your most important metrics displayed on a real-time dashboard.
BuiltWith - Find out the technology behind websites
datapine - datapine offers a lean Business Intelligence software that helps non-technical users to explore, visualize and share their data like never before.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Dasheroo - Dasheroo provides overall business analytics, web analytics, marketing, social media and sales through a data dashboard.
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.