There's ockham's Jiggles script, as mentioned above.  There's a script called "Jello Magnets" buried somewhere in the Python Forum archives, but I'm not sure how developed it ended up being.  There are a few utilities in the marketplace, which all seem to be focused on soft body dynamics for breasts.

As far as I know there's been no hint whatsoever that we should hope for soft body (or any other new) dynamics in any future version of Poser.

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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.