GNU PSPP [0] is what got me into free software after losing access to SPSS in the middle of writing my undergrad capstone.

I’ve long since switched to python & other normal programming for any stats needs. And I only ever scraped the surface of SPSS/PSPP anyways. But, I’d be interested to hear what PSPP doesn’t cover.

Good luck on your project.

[0] https://www.gnu.org/software/pspp/