Microsoft Visio Portable [updated] Download -

: Most portable wrappers (like ThinApp or Turbo) retain the comprehensive library of shapes, templates, and advanced data-linking features found in the desktop version.

Download the official Draw.io Portable executable from the link below, copy it to your USB drive, and never worry about Visio licenses or malware again. Microsoft Visio Portable Download

If you specifically need a portable diagramming tool that can run from a USB drive, consider these legitimate alternatives: : Most portable wrappers (like ThinApp or Turbo)