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Borland Sidekick is a DOS based PIM (Personal Information Manager) and one of the first widely-used TSR (terminate and stay resident) programs. The key feature of Sidekick was that one could use Sidekick's utilities while using most other MS-DOS applications. This was important because MS-DOS had no built-in multi-tasking or task switching capabilities.
Stacker, from Stack Electronics, was a hard drive compression tool. It was wildly popular until Microsoft virtually eliminated the third party market for this by including their own drive compression tool with MS-DOS 6. and Expandz! Plus.
Object Desktop is a set of utilities for OS/2 power users. It provides a number of visual enhancements, define hotkeys, an improved editor, desktop configuration backup, archive management, system help advisors, and system backup.
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.