There are many excellent time-saving scripts available on various 3DCG sites, and it isn't the purpose of this page to catalog them all.  Rather, on this page I list a script if I know about it and either have used it successfully to save time, or if I have strong verification that it saves time.  The emphasis on this page is on free scripts rather than purchasable libraries or utilities.

MEL (Maya) scripts

-- FileTextureManager - a very popular free MEL script which provides a variety of crucial utility functions for Maya texture management.  From

BVH importer for Mathematica
-- BVHImporter
See the section titled "The Package" near the bottom of the page.