Cybersecurity GitHub Repositories (2026) · Open Source Tools

Open-source adversarial testing engine, SDK, and CLI for AI agents. Runs locally or against the Humanbound Platform.

Watcher - Open Source AI-powered Cyber Threat Intelligence & Hunting Platform. Developed with Django & React JS.

The project is a multi-user cybersecurity education chatbot built with Flask, aimed at a school/classroom project.

NeuroSploit is an advanced, AI-powered penetration testing framework designed to automate and augment various aspects of offensive security operations.

A secure low code deception runtime framework, leveraging AI for System Virtualization.

Self-hosted dark web OSINT platform. Automated threat intelligence from query to graph in 13 steps. Free alternative to Recorded Future, DarkOwl, and Flare.

httpx is a fast and multi-purpose HTTP toolkit that allows running multiple probes using the retryablehttp library.

Comprehensive 2026 OSINT guide — 450+ tools, AI intelligence, methodologies & ethics across 35 sections for investigation & threat intel.

MISP (core software) - Open Source Threat Intelligence and Sharing Platform

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

Fast, developer-friendly JS/TS dependency vulnerability scanner with local lockfile scanning, OSV matching, direct vs transitive visibility, --fix, JSON output, and practical remediation guidance.

Cybersecurity Harness

Splunk Security Content

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

CVE proof-of-concept labs, exploit scripts, and detection/prevention rules (Nginx, Apache, Snort, YARA) for high-severity CVEs. Authorized security testing & research only.

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

OWASP Mutillidae II is a free, open-source, deliberately vulnerable web application providing a target for web-security training. This is an easy-to-use web hacking environment designed for labs, security enthusiasts, classrooms, CTF, and vulnerability assessment tool targets.

Unlocking the Full Potential of OPC UA with Typescript and NodeJS - http://node-opcua.github.io/

A programming language exclusively designed for cybersecurity

:key: Hash type identifier (CLI & lib)