Prompt API - Prompt API is a curated API marketplace with high scalability and security for developers.
BuiltWith - Find out the technology behind websites
RapidAPI - API marketplace for finding and connecting to the world's top APIs.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Instabug Integrations Hub - New and improved integrations to build better apps!
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.