You'll find lots of scattered information over in the electronics sub-forum. Busch & Müller are all about StVZO. The inexpensive Chinese-sourced Xanes light and some Taiwanese Owleye lights are StVZO. Cateye offers some StVZO models (US market light on left, StVZO model on right):
I've found the StVZO cut-off to be overly harsh - as an example, there's not enough spill to read house numbers or some street signs. There are bike lights that have a shaped beam but don't comply with the abrupt cut-off of the StVZO: Raveman, PDW.