Are there open instruments to study?

Are all Steinberg or third-party instruments for Halion distributed closed? It would be neat to study a couple of them to learn gimmicks on a real example rather than from the rough developer manual. Maybe my memory doesn’t serve me well, but I think I’ve read somewhere that there are four(?) Steinberg instruments, which are open for learning purposes. Am I wrong?

Factory instruments that come with Halion 6 are open.

Skylab, Hot Brass, Studio Strings, Anima, Eagle, Raven.