Federacy - Bug bounty and security testing platform.
The Security Checklist - The Practical Security Checklist for Web Developers
Bounties Network - Complete tasks, earn crypto
SafeBase - SafeBase is the interactive security portal to share your security posture, automate access to sensitive compliance information, and subscribe to vendor security program updates.
WhiteHub - A crowdsourced security platform
WordPress Security Scanner - Check if your WordPress site has known vulnerabilities