Bugcrowd - Harness the largest pool of curated and ranked security researchers to run the most efficient bug bounty and penetration tests
HTTPDump - A simple, beautiful Webhook debugging tool.
Bounties Network - Complete tasks, earn crypto
httpbin(1) - HTTP request and response service
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.