The Watchport webcam software is called ViViewer. While it does not look as nice as Creative's or Logitech's applications, it does have many more options for webcam customization. You can toggle black-and-white mode or color mode on the webcam. You can also power down the cam or just turn off the front LED (for covert viewing).
There are more options for picture/video quality control in the ViViewer. In addition to the normal brightness and gamma controls, you can change the shutter speed and manual gain percentages.
With the downloadable multi-cam software, you can attach multiple (up to ten) Watchports to the same machine. You cannot do this with any of the Logitech or Creative webcams.