RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
HTTPDump - A simple, beautiful Webhook debugging tool.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
httpbin(1) - HTTP request and response service
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.