Fiddler - Fiddler is a debugging program for websites.
Moving to HTTPS Guide - A community site to help site owners migrate to HTTPS
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Endpoints - View and respond to requests on an HTTP endpoint
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.
FocusOKR - Focus and achieve your goals using Objectives and Key Results