Best open-source Security projects

Zero-backend CLI and web GUI that encrypts HTML pages (or whole static sites) into self-decrypting files protected by a password.

A privacy-first, self-hosted CAPTCHA alternative that verifies users with background proof-of-work and instrumentation challenges instead of puzzles.

Backend server for Bitwarden clients, providing the APIs, SQL Server database and Docker deployment for the password manager.

Open-source identity provider for SSO, supporting SAML, OAuth2/OIDC, LDAP and RADIUS, self-hostable from small labs to large clusters.

Chrome extension that detects which anti-bot systems, CAPTCHAs and fingerprinting techniques a website uses, with confidence scores.

Open-source disk encryption software for creating encrypted volumes and partitions, forked from TrueCrypt 7.1a with security enhancements.

A Python CLI that uses LLMs such as Google Gemini, OpenAI, and Claude to orchestrate penetration-testing workflows around established security tools like nmap and nuclei.

A small, portable C library implementing X.509 certificates and the TLS and DTLS protocols, suited to embedded systems.

Rust-based web application security scanner for penetration testers, with 125+ scanner modules, a browser extension, and an AI-driven testing mode.

A Go-based, extensible security framework for reconnaissance and MITM attacks across WiFi, BLE, HID, CAN-bus and IPv4/IPv6 networks.

AI-driven penetration testing tool that uses multiple LLM providers to generate payloads, scan web targets for vulnerabilities, and write compliance-mapped reports.

Self-hosted network reconnaissance tool in Go that discovers, identifies and monitors devices on your local network with a live web console.