BuiltWith - Find out the technology behind websites

Avira Browser Safety - FREE browser extension. Blocks harmful sites, protects your privacy and finds deals while you shop.

Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.

Norton Safe Web - Safeguard against malicious URLs by scanning your feed using Norton Safe Web.

WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.

WOT Web of Trust - Check if a website is safe before you reach it via browser extensions, mobile app and API.