Beyond Compare is turning 25 and giving 25% off. I will admit there are free tools out there and you can file compare with notepad++ and vs code. However, I've found some of the features in Beyond Compare worth paying for (and not just reinstalling after 30 days of use).
They have had 25% off before, but usually a flash one day sale. This one goes a little longer.
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Edit: For those who are not a developer there is a cheaper version for US$22.50 I believe. You lose the ability to remotely compare files, which I found useful for comparing linux configurations.
So not for everyone, but someone might find it useful.