Nifty - Manage projects, work, and communications in one place.
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
Intercom on Product Management - The ultimate resource for aspiring product managers
Intruder - Intruder is a security monitoring platform for internet-facing systems.
productboard - Beautiful and powerful product management.
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.