Help Net Security newsletters: Daily and weekly news, cybersecurity jobs, open source projects, breaking news – subscribe here!

Please turn on your JavaScript for this page to function normally.
Portmaster
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 …

open-source cybersecurity tools
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: …

DeepTeam
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 …

Tor
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 protects …

cnspec
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 …

Arm Metis
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 are often …

Proton Pass
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 by the …

Strix
Strix: Open-source AI agents for penetration testing

Security teams know that application flaws tend to show up at the worst time. Strix presents itself as an open source way to catch them earlier by using autonomous agents that …

ProxyBridge
ProxyBridge: Open-source proxy routing for Windows applications

ProxyBridge is a lightweight, open-source tool that lets Windows users route network traffic from specific applications through SOCKS5 or HTTP proxies. It can redirect both …

GNU
GNU Coreutils 9.9 brings fixes and updates across essential tools

GNU Coreutils is the backbone of many enterprise Linux environments. It provides the basic file, shell, and text utilities that every GNU-based system depends on. The latest …

sqlmap
sqlmap: Open-source SQL injection and database takeover tool

Finding and exploiting SQL injection vulnerabilities is one of the oldest and most common steps in web application testing. sqlmap streamlines this process. It is an …

VulnRisk
VulnRisk: Open-source vulnerability risk assessment platform

VulnRisk is an open-source platform for vulnerability risk assessment. It goes beyond basic CVSS scoring by adding context-aware analysis that reduces noise and highlights …

Don't miss

Cybersecurity news
Daily newsletter sent Monday-Friday
Weekly newsletter sent on Mondays
Editor's choice newsletter sent twice a month
Periodical newsletter released when there is breaking news
Weekly newsletter listing new cybersecurity job positions
Monthly newsletter focusing on open source cybersecurity tools