Multisim Portable ((free)) -

The device hummed. The analog lattice reconfigured itself—not to her schematic, but to something new. Something that had no name in any Multisim component library. The oscilloscope probe on her bench lit up with a waveform that wasn't a sine, square, or triangle. It was a shape that looked like a question mark made of light.

There is no official "portable" version of NI Multisim (in the sense of a standalone .exe that runs from a USB drive without installation). National Instruments (NI) primarily offers Multisim as a Windows-installed application. multisim portable