Best Open Source Security & Privacy Tools in 2026
Tools for protecting privacy, securing networks, and managing vulnerabilities and security threats.
The most popular pick this year is Pi-hole with 58,573 GitHub stars, but all 8 options below are worth considering depending on your needs.
8 open source security & privacy tools — ranked by GitHub stars. Browse all
Pi-hole
Network-wide DNS-based ad blocking that protects all devices on your network, including Smart TVs and IoT devices.
AdGuard Home
Network-wide DNS-based ad and tracker blocker with parental controls, DNS rewrites, and detailed query logging.
KeePassXC
Cross-platform community-driven port of KeePass Password Safe.
1Password
Vaultwarden
Unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs.
1Password
Bitwarden
Bitwarden infrastructure/backend (API, database, Docker, etc).
1Password
Passbolt
Passbolt Community Edition (CE) API. The JSON API for the open source password manager for teams!
1Password
AliasVault
Privacy-first password manager with built-in email aliasing. Fully encrypted and self-hostable.
1Password
Midas
Open platform for governing execution authority at decision surfaces across agents, AI systems, and enterprise workflows.
How we rank these tools
Tools are ranked by GitHub stars as a proxy for community adoption and trust. Stars reflect how many developers found a project valuable enough to bookmark — a reasonable signal for quality in the open source world. We only list tools that are actively maintained and open source.
Looking for tools you can run yourself? Browse self-hosted security & privacy tools →