HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
Interactive NPS Calculator (by Delighted) - Calculate your NPS easily with this interactive free tool.
Forcepoint Web Security Suite - Internet Security
TinyNPS - Simple NPS feedback
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...
NPS for B2B SaaS - NPS surveys and analytics for B2B teams