BuiltWith - Find out the technology behind websites
MyAdLibrary - MyAdLibrary is the marketing tool that provides you the features to monitor and spy the results of the Facebook ads.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
upRive - Create and scale Facebook ads quickly and efficiently
What CMS - WhatCMS.org looks at a variety of factors within a webpage to determine what CMS a website is using.
Pudding.ai - Real-time ad creative analysis solution that helps marketers to easily understand ad creative performance with actionable insights.