Fiddler - Fiddler is a debugging program for websites.
CodeHub - CodeHub is the most complete, unofficial, client for GitHub on the iOS platform.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Working Copy - The powerful Git client for iOS
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.
Diff So Fancy - Make Git diffs look good