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Acrobat Reader is the free software from Adobe used to read, view, and print documents created by the commercial Adobe Acrobat product. Its primary strength is that documents appear and print identically across differing systems.
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.