Several of the Forgotten Futures collections include spreadsheet templates which were originally written for use with Lotus 123 Executive. Unfortunately this is now somewhat elderly, and includes a WYSIWYG add-on that is incompatible with many later programs. They have been rewritten for Lotus 123 without the WYSIWYG add-on, Microsoft Excel, and Claris Works for Windows. Most spreadsheets can read one or another of these formats.
Some of the Claris templates are somewhat less "bullet-proof" than the others, since some logical functions that seem to work well in Lotus 123 and Excel gave problems. There are probably ways around this, and I would appreciate comments from anyone who feels able to improve them. The Excel templates seem to work well; however, they mostly require Excel 3 to 5 for correct operation.