Best Web Free Open-Source Security Software

Comprehensive authentication framework

Distributed operating system for blockchain app builders

Secure, Simple and Scalable Video Conferences

Open-source antivirus engine for detecting malware across platforms

Bitwarden‑compatible vault hosted on Cloudflare Workers for free

Open source password manager for teams

Automate cloud security and compliance

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

Single Sign-On Multi-Factor portal for web apps

Unified XDR and SIEM protection for endpoints and cloud workloads

Free, open-source password manager

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

Secrets detection for GitHub, GitLab and Bitbucket repositories

Fast and secure backup and versioning for files and directories

Network-wide ads & trackers blocking DNS server

The web app for all your data manipulation and decoding needs

Fast, secure, efficient backup program

High-performance reverse proxy for NAT traversal

A secure password manager for teams

Free backup software to store encrypted backups online

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