I'm an Excel geek, but have switched to LibreCalc, part of LibreOffice. See [
OpenOffice.org].
It's similar, and once you get used to the differences, just as functional. Best of all, it's free. There are other programs within the Office, all for free. They read Microsoft's products and you can save in .xls (or .ods, their extension).
"Let me offer you my definition of social justice: I keep what I earn and you keep what you earn. Do you disagree? Well then tell me how much of what I earn belongs to you - and why?” ~Walter Williams