Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
gitsome - Supercharged Git/Shell autocompleter w/ GitHub integration
Sonar by Facebook - Extensible mobile app debugging for iOS and Android
Endpoints - View and respond to requests on an HTTP endpoint
HTTPDump - A simple, beautiful Webhook debugging tool.
Moving to HTTPS Guide - A community site to help site owners migrate to HTTPS