Fiddler - Fiddler is a debugging program for websites.
Shorten.REST - A URL shortener API you can depend on
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
PixelMe - URL shortener for savvy marketers
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
Pixela - Record and Track your habits or effort. All by API.