Best Web Free Open-Source Security Software

Comprehensive authentication framework

Secure, Simple and Scalable Video Conferences

Bitwarden‑compatible vault hosted on Cloudflare Workers for free

Automate cloud security and compliance

General purpose TLS and crypto library

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

Automate OSINT for threat intelligence and attack surface mapping

The web app for all your data manipulation and decoding needs

The authentication glue you need

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

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.

Secure authentication for Next.js apps

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