HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.
Intruder - Intruder is a security monitoring platform for internet-facing systems.
Documize - Enterprise-grade wiki and knowledge management platform
Nessus - Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.