A first quick attempt an a program that will take as input an XSD and produce a file with random data that conforms to the XSD. Written in a couple of weekends in Python; it is incomplete in that it does not have generators for all of the XSD defined primitive data types. Whether it works for a particular XSD is kind of hit or miss. Available at GitHub. Licensed under GPLv3 with an additional clause to keep my name on it.
I used this as a way to familiarize myself with some Python 3 features as well, especially dictionary comprehensions, so some of the code may look out-of-place to someone who codes for Python 2.x.
Soon, I will be posting/uploading a newer, better (less naive) attempt in a different programming language.