Marp works well if you like Markdown. I cannot, however, speak to things such as transitions (though marp exports to a nice HTML file which includes a PowerPoint-like interface, so I’d imagine it’s possible).

Visidata is excellent for little tasks, I’ve found—and I’ve yet to get into its more serious functionality.

I’m curious how it worked on NixOS. Do you happen to have any Nix config files you can share?

It looked to me to be optional, but yeah I was curious about that too…