Best open-source Security projects

Free, open-source system cleaner and security scanner for Windows, macOS, and Linux that removes caches, malware, and startup bloat.

A bash tool that stores private files encrypted with GPG inside a git repository, shared with trusted users by their public keys.

JARM is an active TLS server fingerprinting tool that sends crafted Client Hello probes to identify server configurations and spot malicious infrastructure.

Open source OSINT automation tool that gathers data on IPs, domains, emails and more from 200+ sources for threat intelligence and attack surface mapping.

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

MCP server and CLI letting AI agents reverse engineer native binaries, Electron apps, .NET assemblies and websites.