crowdsec

pfSense

pfSense is an open-source firewall and router platform built on a hardened FreeBSD base, offering enterprise-grade capabilities like Snort-based intrusion detection and prevention, traffic shaping, native IPv6, and site-to-cloud VPN connectivity. It is free to run as Community Edition software on your own hardware or as a virtual machine. For organizations that want a managed path, developer Netgate sells physical hardware appliances, virtual appliances on AWS and Azure starting around $0.08/hour, and commercial support and training. pfSense is used from small offices to large enterprises for firewalling, routing, and VPN connectivity between sites and clouds.

strix

Strix is an open-source AI penetration testing platform designed to help developers and security teams proactively find and fix vulnerabilities in their applications. By leveraging artificial intelligence, it automates the security testing process to uncover hidden flaws before malicious actors can exploit them. The tool streamlines application security by integrating advanced AI capabilities into your workflow, making continuous security assessments accessible and efficient. It empowers teams to maintain high code quality and robust defense mechanisms without requiring dedicated manual penetration testing for every release.

Nagios Core

Nagios Core is a free, open-source monitoring solution used to track the health of servers, network infrastructure, and services. It monitors CPU, memory, disk usage, and running processes on Linux, Windows, and Unix systems, along with network devices like switches, routers, firewalls, and load balancers, and services such as DNS, DHCP, FTP, SSH, email, and databases. As the original engine behind the broader Nagios monitoring ecosystem, Core is extensible through thousands of community-developed plugins and integrations, letting it monitor almost anything with a status that can be checked. It's distributed under the GPL v2 license with full source code available on GitHub, and runs on major Linux distributions including Ubuntu, CentOS, Debian, and RHEL.