Uppy - The next open source file uploader for web browsers
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
AssetPicker - A free, easy to use, cross plattform ready asset or file picker.
httpbin(1) - HTTP request and response service
Uploader Window - Easy File Uploader for your websites and apps
Endpoints - View and respond to requests on an HTTP endpoint