Traefik - Load Balancer / Reverse Proxy
Fiddler - Fiddler is a debugging program for websites.
nginx - A high performance free open source web server powering busiest sites on the Internet.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Apache Thrift - An interface definition language and communication protocol for creating cross-language services.
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.