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Executor, from Abacus Research and Development, is a commercial DOS based Macintosh emulator. There were also versions for NextStep and Linux. Emulates a 68040 base Mac.
A console utility to extract and create RAR files.
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.