Sniffnet is a free and open-source cross-platform desktop application for monitoring internet traffic. It provides an intuitive interface to track real-time statistics, connected hosts, applications using bandwidth, geolocations, and more.
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mitmproxy
mitmproxy.org
mitmproxy is a free and open-source interactive HTTPS proxy. It allows intercepting, inspecting, modifying, and replaying HTTP, HTTPS, and WebSocket traffic. Popular among developers, security researchers, and pentesters for debugging, API testing, and traffic analysis.
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Wireshark
wireshark.org
Wireshark is the world's leading open-source network protocol analyzer. It captures and interactively browses network traffic, allowing deep inspection of hundreds of protocols for troubleshooting, security analysis, and protocol development.