Talking about #40sday and #mechanicalkeyboard , I made a software long ago (windows only) which is emitting a sound on keydown and on keyup, because I have noise-cancelling headphones, but I like the sound of feedback when I type.
If you're such a pervert like me, you can find it here:

https://github.com/deejayy/cliqsound

But! If you have a great recording setup and willing to send me samples of the sound of your keyboard, I'll include them with the greates pleasure!