BuiltWith - Find out the technology behind websites

BitDefender TrafficLight - Bitdefender TrafficLight is a free add-on that provides a strong and non-intrusive layer of security to your web browsing experience.

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

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

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

URL Void - Free website reputation checker tool lets you scan a website with multiple website reputation/blacklist services to check if the website is safe and legit or malicious.