MetaSurvey - MetaSurvey provides light and high engagement surveys for e-commerce.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
OpenStartup.dev - A collection of open startups
BuiltWith - Find out the technology behind websites
Waves Insights - Consumer Insights SDK for Messaging Platforms
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.