Interactive, file-level Time Machine-like tool for ZFS/btrfs/nilfs2 (and even actual Time Machine backups!)

Very cool, allows listing, filtering and browsing through backed-up individual files on the commandlien.

Very simple, basic functionality slide software. Has a couple of ..interesting features like

Slides with exuberant amount of lines or characters produce rendering glitches intentionally to prevent you from holding bad presentations.

but in general seems quite nice

This article selects 100 TUI apps that largely reflects software our volunteers use as their daily drivers. Free and open source.
(Mostly TUI software, with some really interesting and lesser known software)

Terminal slide presentations. Uses its own markup language (unfortunately) but by doing so comes with some nice features such as emulating a shell command or even typing it with animation.

Another terminal-based slide presentation tool. This one seems nice in that it simply uses markdown and every horizontal rule marks a new slide. Simple, efficient, nice.

Also has a simple guide on how to export slides to pdf on the page.