NetLimiter - NetLimiter is an ultimate Internet traffic control and monitoring tool designed for Windows.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Safetica - We believe data protection should make running your business easier, not harder. Safetica protects companies against insider threats, offers data loss protection, and supports regulatory compliance.
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.
TrafficToll - NetLimiter-like traffic shaping for Linux
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface