Best Free Open-Source Security Software

Private, end-to-end encrypted messaging.

Secrets detection for GitHub, GitLab and Bitbucket repositories

The authentication glue you need

Secure, Simple and Scalable Video Conferences

An open platform for various uses

Network-wide ads & trackers blocking DNS server

Connect, secure, control, and observe services

Unified XDR and SIEM protection for endpoints and cloud workloads

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

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

Secure and fast microVMs for serverless computing

Open‑source V2Ray client for Android, giving power users full proxy control

Secure, fast file transfers from the command line

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

The web app for all your data manipulation and decoding needs

Secure, self‑hosted development environments for teams

Open-source antivirus engine for detecting malware across platforms

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

Single Sign-On Multi-Factor portal for web apps

Open source password manager for teams

Free, open-source password manager

Password management for macOS

Secure password management for Android

Secure password management on Android