Squid Proxy - Website Content Acceleration and Distribution. Thousands of web-sites around the Internet use Squid to drastically increase their content delivery. Squid can reduce your server load and improve delivery speeds to clients.

Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy

Privoxy - Privoxy helps users to protect their privacy.

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.

Artica Proxy - Artica Proxy is an appliance that claim to manage Squid-cache proxy with all features that Squid...

Weer - A HTTP protocol debugger with Chrome DevTools frontend interface