Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface
PFConfig - PortForward's PFConfig Software lets you forward ports on any router for any program.
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.
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.