[majk]

PETEP (PEnetration TEsting Proxy) is open-source Java application for network communication proxying for the purpose of penetration testing. It allows penetration testers to setup proxies (TCP, UDP) and interceptors to manage the traffic transmitted between client and server. PETEP can also be used in combination with well-known HTTP proxy tools like Zaproxy. There is support for extending the PETEP with custom intercepting functionality and custom proxies (for custom protocol support).

Website: https://petep.warxim.com/
GitHub: https://github.com/Warxim/petep
Tutorial: https://youtube.com/watch?v=DPXEPLYttgQ  (Using PETEP for hacking vulnerable client-server application)

[majk]

PETEP (PEnetration TEsting Proxy) v2.2.0 released!

PETEP is an open-source TCP/UDP Proxy with support for modifying the transmitted data in graphical interface manually or using automatic rules. PETEP has multiple features including filterable History of transmitted data, automatic tagging based on simple rules, resending traffic and scripting own automatic traffic modification code.

If the current features are not enough, you can always extend the PETEP functionality by using well-known pentesting proxies (e.g. Burp, Zaproxy) and modify the binary protocols inside these, since PETEP allows you to wrap binary communication for them.