VirusTotal - VirusTotal is a free service that analyzes suspicious files and URLs and facilitates the quick...
BitDefender TrafficLight - Bitdefender TrafficLight is a free add-on that provides a strong and non-intrusive layer of security to your web browsing experience.
Hunter TechLookup - Create lists of websites by technology for free
WOT Web of Trust - Check if a website is safe before you reach it via browser extensions, mobile app and API.
URLscan.io - urlscan.io is a free service to scan and analyse websites. When a URL is submitted to urlscan.io, an automated process will browse to the URL like a regular user and record the activity that this page navigation creates.
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.