OSL is a simple pbbuttonsd (used on Apple laptops
to access the 'special keys' like volume, eject,
etc.) client. It uses the xosd-lib to display the
current values which makes it look a lot more like
OSX than other pbbuttonsd-clients.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.