Makes directory index pages (either local or remote open directories) actually useful. Adds sidebar and content preview pane; keyboard navigation; sorting; light/dark UI; preview images/fonts in navigable grids; browse subdirectories w/o page reload (“tree view”); media playback, shuffle/loop options; basic playlist (m3u, extm3u) & cuesheet (.cue) support; create, edit, preview, save markdown/plain text files; open font files, view complete glyph repertoire, save glyphs as .svg; more.
Wow, that's a lot of work. Looks cool