I've been using AlDente (yes, the battery charge limiter app) for a while now. I started using it when I first bough the Macbook Air.
Today, I though to myself, "I've been using this and it's obviously an important thing to me. Why not buy the Pro version?"
This made so much sense to me and I had similar thoughts in the past, so I bought AlDente Pro, the lifetime version.
When I run into good software that I know I'll need in the future, I usually end up buying it after using the free edition of the software for a while. I've no problem with giving back, especially if the software owner is an independent developer. Developers have to eat, too!
I'm also a flight sim guy (I recently bought several DCS World modules and I fly IL2: Sturmovik too). I bought TacView (Advanced version) a long while back because I love how you can replay previous flights and use TacView to analyze a combat situation. TacView wasn't cheap - it was $70 - but I used it to the point that I hated when I flew something that TacView couldn't work with, so I bought it.