How about Music players, Sequencers, studio, DJ, Drum machines, Guitar software amps, software radios…

The fact that you simply ignored music players disqualifies your list. Also considering that Arch’s AUR, for example has over 90.000 packages, the idea of one person compiling a useful general “best of” list is deluded and doomed from the start.

I don’t write this acrimoniously, I simply state the fact that unless you enlist help (and a lot at that) your endeavor is useless.

Not to disparage your effort, but I looked into music and I only see:

Audio & Music

Audacity Audire Audile

Aaaand I’m out.

This is so lopsided it should be titled “A random collection of free software that has caught my eye”