You can use Emulation on your preferred platform; it is available on Mac OS X and Windows XP & Vista.
Emulation software is shipped with a USB to DMX interface. The interface sends out 512 channels through a ESD protected DMX512-A port. Once the hardware interface is plugged in your computer the DMX data is duplicated over Art-Net. This is also useful for connecting to 3rd party visualizers.
The cuelist system in Emulation, used for programming light sequences, is analog to the systems used on larger lighting consoles. It features separate Delay, Fade in & Fade out timing and comes with a shape generator and programmer window.