Surely you're brewing with the open-source Brewtarget?
It's a beer recipe planning / brewday helper software.
Personally I've been using it for years and been really happy with it.
Such a cool app I will look it up in my repo (Mint) since it is also Linux. I have been using some ancient excel sheets until now.
Yes, Linux support is a big deal for me too.
For any Archers out there, it's available in AUR: https://aur.archlinux.org/packages/brewtarget
I got from Manjaro after I realised that I don't need bleeding edge software and I was capable of destroying my installation several times, so Mint with Xfce it is.
Also software that I needed arch for I didn't need anymore.