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A completely free, open-source diagramming tool. It features a dedicated web app and a downloadable desktop version that can run natively from a USB drive without installation. It opens and edits official .vsdx Visio files natively.
Third-party "portable" apps are often packed with adware, spyware, or ransomware [Source: Common Cybersecurity Best Practices]. Microsoft Visio Portable Download
Users typically seek out a portable version of Visio to bypass common enterprise and hardware constraints: A completely free, open-source diagramming tool