Melissa Data Quality - Melissa helps companies to harness Big Data, legacy data, and people data (names, addresses, phone numbers, and emails).
BuiltWith - Find out the technology behind websites
CrankWheel - Insanely simple, enterprise-friendly screen sharing, free for individual use.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Denali (Cougar) - Denali (Cougar) is software develops leading on-premise accounting solutions for small to mid-sized businesses.
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.