RingLead - RingLead offers a complete end-to-end suite of products to clean, protect, and enhance company and contact information.
BuiltWith - Find out the technology behind websites
Microsoft Data Quality Services - Data Quality
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Oracle Data Quality - Overview of Oracle Enterprise Data Quality
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.