WordNet (r) 3.0 (2006):

stand-alone
    adj 1: capable of operating independently

The Free On-line Dictionary of Computing (30 December 2018):

stand-alone

    Capable of operating without other programs,
   libraries, computers, hardware, networks, etc.  Exactly what
   is absent is presumed to be obvious from context.

   "We only run Windows on stand-alone PCs because it's too
   dangerous to run it on networked ones."

   (1998-02-11)