Bugcrowd - Harness the largest pool of curated and ranked security researchers to run the most efficient bug bounty and penetration tests
Cyberdesic - Cybersecurity professionals, on demand
HackenProof - The world trusted Bug Bounty Platform for crypto projects
Axonius - Cyber security asset management to see and secure all
Cybrary - Free courses in cyber security
Pearler - Pearler is a set of tools that help vendors avoid the pain of RFx and security questionnaires.