Yep. The Stew Mac calculator is pretty good.
I also use WFret a free program from the Musical Instrument Makers Forum. I like WFret because it allows you to print out a paper pattern that you can tack-glue to the fretboard and literally cut-on-the-dotted-lines, rather than mis-transferring numbers from a spreadsheet to wood.
For Just Intonated fret spacing on my Traditional dulcimers with staple frets, I use the calculator developed by Rob Reinsal here several years ago. It's discussed here: https://fotmd.com/strumelia/group_discuss/2457/latest-ji-calculator
updated by @ken-hulme: 08/11/19 07:53:35PM