Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Mattermark - Ranking 800,000+ high growth Internet companies
BuiltWith - Find out the technology behind websites
Breakout List - A list of the fastest growing startups
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
Ennerate - Automated business valuations for 'Main Street' companies