Codeplace - Learn how to code by building real web apps
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
zeroqode - Build your app up to 10x faster with no-code app templates
Endpoints - View and respond to requests on an HTTP endpoint
NoCode.tech - Free tools & resources for non-tech makers and entrepreneurs
httpbin(1) - HTTP request and response service