Top NETWORK-SECURITY GitHub Repositories & Tools (2026)

SAM

Free, open-source application firewall for macOS. Little Snitch alternative with zero telemetry. Native SwiftUI world map, rules manager, DNS over HTTPS, pf-based blocking. Signed, notarized, MIT licensed.

Fast, multi-protocol credential brute-forcer. Parses Nmap, Nessus, and Nexpose output to automatically test default and custom credentials across 30+ protocols.

Terminal UI for WireGuard and OpenVPN with multi-tunnel control, real-time telemetry, and leak guarding.

Python-based Comprehensive Network Packet Analysis Library

Batfish is a network configuration analysis tool that can find bugs and guarantee the correctness of (planned or current) network configurations. It enables network engineers to rapidly and safely evolve their network, without fear of outages or security breaches.

Scan the devices connected to your WIFI / LAN and alert you the connection of unknown devices. It also warns if a "always connected" device disconnects. In addition, it is possible to check web services for availability. For this purpose HTTP status codes and the response time of the service are evaluated.