Many computers come with a version of Microsoft Works that includes a spreadsheet program that works fine for tuning. Otherwise Excel. I use a VERY old version. Seems the older the copy of Excel, the better it runs. Kinda like Windows...
Do you realize a modern computer is over 500 times faster than the first PC's (4mHz, 8-bit, vs 2gHz 64-bit) ? But the time it takes to boot, open a spreadsheet, recalculate, save, and exit is still the same? But at least today we have dancing paperclips to show for the speed increase.
Trivia: Lotus 1-2-3 was the first popular spreadsheet for the PC (a rip-off of VisiCalc for CP/M). It was written entirely in assembler and was about 96,000 bytes. Windows is currently 11,717,500,129 bytes, or over 100,000 times larger than a spreadsheet application.