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A completely free, open-source tool that works in your browser or as a desktop app. It is powerful enough for complex flowcharts and network diagrams. Part of the free LibreOffice suite
Microsoft offers a low-cost, web-based version of Visio that provides the essential tools for a small monthly fee, ensuring you are always legal and secure. Part of the free LibreOffice suite, this is
Cybersecurity Report on Pirated Software Vulnerabilities (2023)