Intruder - Intruder is a security monitoring platform for internet-facing systems.
Watchtower - "Watchtower monitors your competition's websites and alerts you to important changes instantly."
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
Material Design for Bootstrap 4 - Powerful and free UI KIT for the newest Bootstrap 4 and Material Design