In the old days, when there was nothing but analogue video, many companies used to write their drivers to suit QuickTime, but these days the hardware does a wide variety of things, so they tend to write their own drivers that just work with their apps.
That device will probably only work with El Gato's EyeTV Software.
There are other options though - you can buy kit that uses a standard chipset, then use open source drivers to suit that chipset.
If you want you can then write your own app to use those drivers:
For more info see here:
http://www.defyne.org/dvb/driver.html