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socat - socat is a relay for bidirectional data transfer between two independent data channels.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
netcat - Netcat is a featured networking utility which reads and writes data across network 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.
Packet Sender - Packet Sender can send and receive UDP, TCP, and SSL on the ports of your choosing.
Weer - A HTTP protocol debugger with Chrome DevTools frontend interface