Best Free Open-Source Security Software

Secure password management on Android

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 password vault built for teams, with instant sharing and audit trails.

Secure authentication for Next.js apps

A modern, secure password manager

Advanced offline password cracker supporting hundreds of hash types

Battle‑tested Solidity library for secure smart contract development

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

Secure, self‑hosted development environments for teams

Secure password management for Android

Real‑time spatial intelligence from ordinary WiFi signals

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

Interactive application firewall for GNU/Linux

Safe home for all your data

Privacy-focused Segment alternative

Stateless password manager

Connect, secure, control, and observe services

Open-source antivirus engine for detecting malware across platforms

Deduplicating backup solution

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