BuiltWith - Find out the technology behind websites
Fulfilli - Quoting software as a service (saas) for successful digital agencies.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Zimit - Configure price quotes for services
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
QuoteForm - Create price calculator forms with conditional pricing