Top FIREWALL GitHub Repositories & Tools (2026)

Open-source IDS/IPS, WAF and bot detection for Linux, Windows, Docker and Kubernetes, with a crowdsourced blocklist of malicious IPs.

A fast reverse proxy to help you expose a local server behind a NAT or firewall to the internet.

OWASP Coraza WAF is a golang modsecurity compatible web application firewall library

OPNsense GUI, API and systems backend

Fort Firewall for Windows

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.

A Go implementation of ICE

CIDRAM: Classless Inter-Domain Routing Access Manager.

10-20x more blocks for your CrowdSec bouncers — 120k+ IPs from 32 free threat feeds