Greenbone is an open-source vulnerability management solution to harden your systems against cyber threats. Offers automated vulnerability management systems with customizable scan configurations and schedules for ongoing vulnerability detection to identify potential weaknesses before they are exploited. Grintor explains, "Formally OpenVAS - open source alternative to Nessus.”

Xen Orchestra simplifies administration of XCP-ng, Citrix Hypervisor, or XenServer pools, providing a comprehensive view of virtual machine infrastructure. With no need for host installations, it offers remote accessibility from any device, ensuring efficient management without the burden of additional agents.

Kevtech IT Support is a practical YouTube channel intended for individuals who are looking to forge a career in technology, offered by a guy who had to find his way without guidance. Kindly suggested by Emphasis-Hungry.

Element is an open-source instant messaging client built on the Matrix protocol, offering users features such as end-to-end encryption, file sharing, and voice/video calls. The self-hosted version accommodates up to 200 users at no charge, providing a budget-saving secure and collaborative communication platform. perthguppy describes it as a "slack style team chat."

KasmVNC offers heightened security, improved compression, and seamless encoding through a web-based client, enabling access to the Linux server's desktop from any web browser without the need for client software installation. Glum_Competition561 says it's a "wonderful product, especially for browser isolation and sandbox environments to play with some risky stuff. :)"

Simplilearn is a YouTube channel offering training content aimed at IT professionals who want to stay current on evolving technologies and best practices in the field. Thanks for the recommendation go to Present-Chard.

RedHat Keycloak is an Identity and Access Management tool. Features include user federation, robust authentication methods, user management, and fine-grained authorization. Grintor describes it as an "open source alternative to okta.com."

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fsv is a file system visualizer for comprehensive exploration and analysis. Utilizes a 3D layout, with both MapV and TreeV views, to facilitate unique perspectives on file hierarchy. For viewing permissions, phein4242 says, "It doesnt get any better than FSN/FSV."

RT for Incident Response is a robust open-source tool for CERT and CSIRT teams, offering an efficient workflow for incident handling. This industrial-grade solution facilitates incident tracking, response, and resolution through a straightforward interface, along with a suite of tools aimed at streamlining routine operations for team members. Appreciation for this one goes to Quadling.