$20 isn't that much but if i can download a Linux operating system with open office for free, i think there should be available solid free home brewing software. especially considering home brewing is very much a DIY hobby.lots of the pay packages have free trials that will make you realize the $20 or so purcahse price is cheap for everything it does.
https://www.homebrewtalk.com/f84/brewtarget-1-2-free-open-source-brewing-software-153755/
Works well, cross platform, open source.
I usually use qbrew in in linux. Like others have mentioned, ut is much less feature rich. In a lot of cases, I prefer a simpler interface with only the essential features. Qbrew could use a little more, but it works for most of what I do. I keep meaning to try out brewtarget, I hear good things.
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