Ah yes you can tell by the post title:
best linux terminal emulator
For me: Wezterm. It does pretty much everything. I don't think Alacritty/Kitty etc. offer anything over it for my usage, and the developer is a pleasure to engage with.
Second place is Konsole -- it does a lot, is easy to configure, and obviously integrates nicely with KDE apps.
Honorable mention is Extraterm, which has been working on cool features for a long time, and is now Qt based.
Just note that the comment was inaccurate, in that their weird encryption is indeed open source at least.
I'd say an important part of this calculator's interaction model is doing something, getting a result, then doing something else to that result. That's not too bad in the regular Python interpreter either.
For example, in Python:
>>> 5
5
>>> 4 + _
9
>>> 2 * _
18
In Stacker:
>>> 5
[5]
>>> 4 +
[9]
>>> 2 *
[18]
Does Hy have something like the Python interpreter's _?
So it looks like a totally different data flow style, and (I think) geared toward writing then running programs, whereas Stacker is more for interactive stack-oriented calculator tasks.
I've never used Hy. Does it offer any concatenative-style interaction?
If you choose to give Fedora a try, I recommend Ultramarine, which has more set up from the start, including their "Terrs" repository with more updated packages.