Best Linux Free Open-Source Security Software

Private, end-to-end encrypted messaging.

Simple vaultless password manager in Go

An open platform for various uses

Secure and fast microVMs for serverless computing

Patch-level verification for Bundler

A secure password manager for teams

Unified XDR and SIEM protection for endpoints and cloud workloads

Run data science on remote data without moving it.

Automate OSINT for threat intelligence and attack surface mapping

Fast and secure backup and versioning for files and directories

Network-wide ads & trackers blocking DNS server

Fast, secure, efficient backup program

High-performance reverse proxy for NAT traversal

Generate Software Bill of Materials from container images and filesystems

Free backup software to store encrypted backups online

A modern, secure password manager

Network-wide ad blocking DNS server for homes and small businesses

The all-in-one multi honeypot platform for comprehensive network defense.

Interactive application firewall for GNU/Linux

Stateless password manager

Open-source antivirus engine for detecting malware across platforms

Lightweight Intranet Penetration Proxy Server

Interactive, scriptable man‑in‑the‑middle proxy for HTTP, HTTPS and WebSocket traffic

Fast and lightweight DNS proxy as ad-blocker for local network