JavaScript Operator Lookup - A full list of JavaScript operators with examples
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
JavaScript Quiz - Check your knowledge by having fun.
Intruder - Intruder is a security monitoring platform for internet-facing systems.
JavaScript.com - A free resource for learning and developing in JavaScript
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.