For me, that would be Secure CRT. I have yet to find a terminal emulator that matches its feature set. If you regularly manage hundreds of machines using various connection protocols (serial and ssh mostly in my case) It’s worth the $$$, and so far there hasn’t been any subscription nonsense. I liked using it at work so much I forked over the dough to have it at home.
None of the free alternatives do everything I need.
I’ll also mention a few iOS apps. One is Sun Surveyor. It’s an AR app that shows you the position of the sun, moon, and galactic center at any given time. The other would have to be Radarscope. It’s a weather radar app, but it’s a really good weather radar app.
EDIT:
This one’s debatable, but I use it all the time. Plasticity is 3D modelling software that attempts to bridge the gap between practical CAD programs and software meant for 3D artists like Blender. It’s not cheap considering Blender is free, but it’s buy once use forever, and at (I think) $150 it’s within reach of an individual hobbyist who knows what they want and is willing to pay for it.
donate the money to somebody who runs a fediverse server. running servers costs money every month, and that can’t be eliminated either because hardware can’t be optimized out of existence.
I only use the fediverse for social media, and even I wouldn’t necessarily recommend this. If you’re a wealthy individual and understand the cost, sure; go for it! But as far as an “investment”, or recouping costs spent, giant corporations spin up servers and start services to entice users, knowing they’ll eventually earn that money back in data collection and ads. The fediverse **will not** put up with that, so know what you’re getting yourself into…