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Fiddler - Fiddler is a debugging program for websites.
NetLimiter - NetLimiter is an ultimate Internet traffic control and monitoring tool designed for Windows.
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
cFosSpeed - cFosSpeed is a network driver, which attaches itself to existing Internet connections.
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.
Wonder Shaper - A bandwidth limiting and traffic prioritization tool for linux.