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.
Every single major commercial 3D CAD suite is still better than FreeCAD. FreeCAD is not the unusable beast it used to be, in fact it’s very much better, but it has technical debt and structural limitations that just keep it worse.
And this infuriates me because the market for those suites is so oppressively terrible.
Like, hell, I don’t even need the full suite of simulation and modeling tools that they come with. Just give me a rock-solid parametric CAD engine, a decent rendering suite tacked on to it, and I’d really love it if anyone in this market could start investigating Linux compatibility! Hell, I’d even pay for that - just not the awful licensing regimes the current offerings operate under.
I would kill for Rhino 3D on Linux…
However, these days I usually prefer OpenSCAD to Grasshopper for parametric.
I bought Alibre Design, as it was a less oppressive situation license-wise, but these days I find I’m using it less than I might simply because I prefer staying in Linux for literally anything else. It was a bit pricy, but at least it was a perpetual license. I am hearing that while they don’t intend to support Linux, they’re moving away from some of the libraries that have prevented Proton from working.
The rest are varying degrees of oppressive lock-in and feature erosion. PTC/OnShape in particular has a huge “Fuck-You” attitude towards anybody who wants to consider throwing a design up on Etsy or selling a few trinkets without paying out the ass for a professional-grade subscription, and being the only fully mature web-based tool, it’s the only one that works properly in Linux.
+1 for Alibre.
With v29 (release probably in march) they are changing the UI framework, the last thing preventing it on any other OSs. In the latest live stream on YouTube they hinted that they would look into a Linux port if there is enough interest. 3 of 4 hosts in the stream gave a thumbs up for Linux, so there is hope.
Edit: Link to the stream https://youtu.be/uDheVp1OH4Y?t=5184
Compared to other CAD its cheap as hell. Especially if you don’t need the all features, you can get Atom3D for less than 300€. For everyone interested: wait for promotions, the price is heavily discounted a few times per year.