Aren't they all kind of inspired by the original Perl implementation? I use the Ruby one for testing.

Something kind of similar and worth thinking about is this:

http://en.wikipedia.org/wiki/QuickCheck

I was just about to comment the same thing about QuickCheck. Arbitrary data galore.

I've only done serious work with QuickCheck in Haskell but here's the python implementation I've played with: https://pypi.python.org/pypi/pytest-quickcheck/

> Aren't they all kind of inspired by the original Perl implementation?

The original Perl implementation is Data::Faker (https://metacpan.org/pod/Data::Faker). The earliest version available on CPAN appears to be from 2005.