BuiltWith - Find out the technology behind websites

Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!

Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.

SurveyCount - Make and distribute surveys

WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.

Crowdoscope - A research tool for real-time collective intelligence.