Best Web Free Open-Source Security Software

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

Fast and secure backup and versioning for files and directories

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

The web app for all your data manipulation and decoding needs

General purpose TLS and crypto library

Open-source antivirus engine for detecting malware across platforms

High-performance reverse proxy for NAT traversal

Secrets detection for GitHub, GitLab and Bitbucket repositories

Secure, automated dependency management for Node.js projects

Secure, self‑hosted development environments for teams