Ask HN: Open-Source Alternatives to Keyclick

I'm a fan of keyclick (http://sustworks.com/site/prod_keyclick_overview.html), a tiny piece of software for OS X that produces artificial and yet oddly satisfying audible responses to using the keyboard.

Sadly, it hasn't been updated since 2012 and I'm wary of paying for something that may well have been largely abandoned. On top of that, I'm not totally fond of the idea of handing access to OS X's powerful accessibility features to a closed-source piece of external software.

Any suggestions?