Replay - One-Click Video Editor for iOS
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Endpoints - View and respond to requests on an HTTP endpoint
Reactime - Time travel debugging tool, visualizing and tracing state
httpbin(1) - HTTP request and response service
Remote Duck - Stranger on the Internet that can help you debug your code