Find and Explore Free Cybersecurity Resources.
Stop paying for expensive licenses. OpenSec Atlas is the largest directory of free and open-source security resources, including tools, scripts, and frameworks. Discover alternatives for SIEM, EDR, XDR, and more, all deeply integrated with frameworks like MITRE ATT&CK, CIS, and NIST to supercharge your security operations.
Find the right tool every time.
Discover the hidden gems you're missing.
The Problem
"My web app failed an audit for XSS vulnerabilities. Where do I start?"
Describe Your Goal
tools to find and fix XSS in a Python app
Select the Right Tool
OWASP ZAP
Bandit
Why OpenSec Atlas?
Curated, Not Crawled
Every repo reviewed for relevance and health.
Deep Intelligence
Cross‑mapped to MITRE, CIS, and NIST.
Instant Insight
Stars, commit activity, maintenance, and license at a glance.
9,000+
Tools & Resources
100+
Curated Categories
Daily
Updates
2,500+
Community Members
Trusted by Security Professionals
"OpenSec Atlas is my go-to starting point for any security tooling research. The deep mapping to MITRE ATT&CK is a game-changer for building out our defensive capabilities."
Principal Security Engineer
"I've discovered so many underrated open-source gems here that I now use daily. It's like having a curated arsenal at your fingertips. Invaluable for any red teamer."
Lead Penetration Tester
"This directory saves me hours every week. Instead of sifting through dozens of GitHub repos, I can quickly find vetted, active projects that fit directly into our CI/CD pipeline."
DevSecOps Architect