GUIDO Music Learning System (1996) 0 Audio DOS

First Released in 1986 by the University of Delaware, GUIDO (Graded Units for Interactive Dictation Operations) was self-paced Ear Training instructional software designed by and for use at the University of Delaware. It was originally programmed on a Burroughs 6700 and later ported to the PLATO system, before it was redesigned for use on the IBM-PC/XT/AT.

• 2.1

Sidekick (1984) 4 Utility PIM DOS

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.

• 1.x
• Plus
• 2.0