40 open-source tools redefining how security teams secure the stack

Open source security software has become a key way for teams to get flexibility, transparency, and capability without licensing costs. The free tools in this roundup address problems security... Read more »

UTMStack: Open-source unified threat management platform

UTMStack is an open-source unified threat management platform that brings SIEM and XDR features into one system. The project focuses on real time correlation of log data, threat intelligence,... Read more »

The Bastion: Open-source access control for complex infrastructure

Operational teams know that access sprawl grows fast. Servers, virtual machines and network gear all need hands-on work and each new system adds more identities to manage. A bastion... Read more »

Portmaster: Open-source application firewall

Portmaster is a free and open source application firewall built to monitor and control network activity on Windows and Linux. The project is developed in the EU and is... Read more »

Hottest cybersecurity open-source tools of the month: November 2025

This month’s roundup features exceptional open-source cybersecurity tools that are gaining attention for strengthening security across various environments. Heisenberg: Open-source software supply chain health check tool Heisenberg is an... Read more »

DeepTeam: Open-source LLM red teaming framework

Security teams are pushing large language models into products faster than they can test them, which makes any new red teaming method worth paying attention to. DeepTeam is an... Read more »

Tor Project is rolling out Counter Galois Onion encryption

People who rely on Tor expect their traffic to move through the network without giving away who they are. That trust depends on the strength of the encryption that... Read more »

cnspec: Open-source, cloud-native security and policy project

cnspec is an open source tool that helps when you are trying to keep a sprawling setup of clouds, containers, APIs and endpoints under control. It checks security and... Read more »

Metis: Open-source, AI-driven tool for deep security code review

Metis is an open source tool that uses AI to help engineers run deep security reviews on code. Arm’s product security team built Metis to spot subtle flaws that... Read more »

Product showcase: Proton Pass, a password manager with identity protection

Managing passwords can be a real headache, and it’s still common to fall back on reusing them or storing them in a browser without much protection. Proton Pass, built... Read more »
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