Best Free Security Software

Private, end-to-end encrypted messaging.

The world’s most popular messaging app.

Free, open-source password manager

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

Free backup software to store encrypted backups online

A simple, fast, and secure note-taking app

Open source password manager for teams

A secure password manager for teams

Deduplicating backup solution

The authentication glue you need

Fast, secure, efficient backup program

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

Interactive application firewall for GNU/Linux

Secure password management on Android

Fast and secure backup and versioning for files and directories

Secure password management for Android

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

Network-wide ads & trackers blocking DNS server

Secure, Simple and Scalable Video Conferences

Secure, fast file transfers from the command line

Lightweight Intranet Penetration Proxy Server

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

Cross-platform password manager compatible with Keepass 2.x

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