imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
httpbin(1) - HTTP request and response service
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
HTTPDump - A simple, beautiful Webhook debugging tool.
Gumlet - Gumlet is an end-to-end video streaming and image delivery platform
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.