Whaw comes from John Meacham. It’s awesome (pardon the pun) for use with tiling windows. I added a few extra command line options so you can move the “hot pixel” around on the screen.
I highly recommend that you spend 30 seconds and read the description of how to use it.
Link to my version: whaw-0.1.2.andy.tar.gz
To install you might need:
sudo apt-get install libxmu-dev