I just compiled a version of keycastr and put it here since I could not find a precompiled version that’s relatively new.
Keycastr is used for presentational demos. It’s free and the source is here in this github repo. You will need a modern version of Xcode to compile it.
The version that is compiled is by creemama. I only blindingly updated the settings with Xcode recommendations. This “works for me” on OS X 10.8.3.