Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
HTTP Prompt - An interactive command-line HTTP client
Endpoints - View and respond to requests on an HTTP endpoint
QR Menu Creator - Create a no touch QR code menu for your restaurant/bar free
httpbin(1) - HTTP request and response service
Book In A Box - Book writing & publishing as a service