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