Ockham has one which mirrors groups and another which flips .obj files over the x axis.  I don't think I've seen one for x symmetry with morphs.  If there is one, I want to know, too!  :)

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.