HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
Hack The Box - An online platform to test and advance your skills in penetration testing and cyber security.
Intruder - Intruder is a security monitoring platform for internet-facing systems.
VulnHub - VulnHub provides materials allowing anyone to gain practical hands-on experience with digital security, computer applications and network administration tasks.
Forcepoint Web Security Suite - Internet Security
TryHackMe - TryHackMe is an online platform for learning and teaching cyber security, all through your browser.