BuiltWith - Find out the technology behind websites
Ethereum Live - All the latest updates on Ethereum
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Ethereum Price - ETH live price + updates from the industry
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.
Pragma - The home base for Ethereum developers.