* [SafeLine v9.4.2](https://github.com/chaitin/SafeLine) – Self-hosted web application firewall and reverse proxy that protects web apps from various attacks.

* [portchecker.io v4.2.0](https://github.com/dsgnr/portchecker.io) – API for checking port availability on specified hostnames or IP addresses to assist network troubleshooting and firewall validation.

* [SysWarden v4.10.0](https://github.com/duggytuxy/syswarden) – Enterprise-grade hardened HIDS/HIPS for Linux that enforces CIS Level 2 hardening and orchestrates zero-trust network defense plus a Go-based WAAP/WAF engine.

* [Zen 1.8.46](https://github.com/AikidoSec/firewall-node) – Embedded Web Application Firewall for Node.js that autonomously scans input and blocks SQL injection, SSRF, path traversal, and other attacks.

* [Netspoc 2026-09-16-1647](https://github.com/hknutzen/Netspoc) – Network security policy compiler that generates and optimizes device-specific firewall rules from a central ruleset and topology.