Website Defender

What it does

A lightweight WAF (Web Application Firewall) for protecting web applications

Castellum — the fortress at your edge. A lightweight, self-hosted WAF and access-control gateway.

Castellum is a lightweight, open-source WAF (Web Application Firewall) that adds unified authentication, access control, and security policies to any web application -- without modifying a single line of your application code. Deploy once, protect everything: code repositories, CI/CD tools, monitoring dashboards, package registries, and any other web service. Enterprises expose internal tools to the internet every day. These applications often lack: Castellum solves all of these with a single binary that integrates transparently with Nginx. graph LR User[User / Browser] --> Nginx Nginx -->|1. Auth Check| Castellum[Castellum] Castellum -->|2. Allow / Deny| Nginx Nginx -->|3. Proxy if…from defender.flmelody.org

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  BunkerWebJan 2026 · bunkerweb.io · ▲6

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