I used Dejavu sans mono (but modded to have a slashed 0. It’s based on Gnome’s Vera font, but at the time it had a very large open type feature set that appealed to me.

https://dejavu-fonts.github.io/

Edit: bumped send before finishing thought…

Fira was my replacement, but I never really could get used to the operators ligatures, so left them disabled. I’m about to switch and try Neon or Argon (though I may end up mixing them a bit if it’s not too much work). Jetbrains has a neat design, but the r and f feel really out of place and I’d have to mod them to not be annoyed all the time.