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Switcher is an add on utility program written by Andy Hertzfield and released by Apple that adds the ability to load multiple programs and quickly switch between them - something that MacOS lacked at this point.
SY-TOS is a powerful backup program for DOS, and other operating systems. It was commonly customized for and bundled with OEM backup hardware. SY-TOS Plus was the first retail standalone version.
Toast was a popular CD mastering and burning application for classic Apple Macintosh. It was created by Astarte, who sold it to Adaptec, and later Roxio. Adaptec sold a different program for IBM PC compatibles named CD Creator