Best Linux Free Open-Source Security Software

Private, end-to-end encrypted messaging.

Secure dotenv for developers

Cross-platform password manager compatible with Keepass 2.x

Simple vaultless password manager in Go

An open platform for various uses

Secure and fast microVMs for serverless computing

Open-source antivirus engine for detecting malware across platforms

Patch-level verification for Bundler

Advanced offline password cracker supporting hundreds of hash types

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

Unified XDR and SIEM protection for endpoints and cloud workloads

Run data science on remote data without moving it.

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

Automate OSINT for threat intelligence and attack surface mapping

Secure, fast file transfers from the command line

A note-taking app with a focus on security and simplicity

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

A secure password manager for teams

Generate Software Bill of Materials from container images and filesystems

Free backup software to store encrypted backups online

Secure, private budgeting for individuals and households