Annotable - Ultimate image annotation & markup tool
BuiltWith - Find out the technology behind websites
Weava - Workspace to highlight, organize & collaborate on your research articles.
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Airsketch - Simple screenshots + annotations for Mac 🖥️
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.