Microswift Calc evolved into Swiftcalc from Timeworks and became GEOS compatible, I bought Swiftcalc to try with my GEOS setup and it was a dog, looked pretty, but was slow and painful.
Houseplan was honed and converted over the years to different formats, "As Easy As" a clone of Lotus 123, Borland's QuattroPro and finally Microsoft Excel.
It is still being used today as an expenditure/tax planning tool.
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