Open source. Open possibilities.

An interactive, TLS-capable intercepting HTTP proxy designed for penetration testers and software developers to analyze network traffic.

Toxiproxy is a framework for simulating network conditions to test application resiliency and identify single points of failure in CI and development environments.

Whistle is a cross-platform network packet capture and debugging proxy based on Node.js, supporting HTTP, HTTPS, HTTP/2, WebSocket, and TCP packet capture with request/response modification. It offers HTTP, HTTPS, Socks, and reverse proxy modes, includes built-in tools like Weinre, Console, and Composer, and is extensible via rules and plugins. It runs on macOS, Windows, and Linux.

bettercap is a Go-based, extensible security framework for reconnaissance and MITM attacks across WiFi, BLE, HID, CAN-bus, and IPv4/IPv6 networks, with a REST API, web UI, and JavaScript plugins.