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.
Almost all video game genres are overwhelmingly dominated by closed-source, commercial software. FOSS generally isn’t competitive there.
I’d give FOSS the upper hand in traditional roguelikes and playing card solitaire implementations, maybe. Maybe chess AIs. Purely-text interactive fiction of the stuff that one might find on The Interactive Fiction Archive isn’t mostly FOSS, but is frequently non-commercial.
That’s a pretty small portion of what game stuff is out there.
But, yeah, for most non-game stuff, I’d agree; I’d rather use the FOSS options.