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.

Iterate - Get the feedback you need to build better products

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

Refiner - Customer Feedback Surveys For SaaS