Norman has an extensive list of Plugins and donationware products, the most well known of these being the dropdown product menu for Sellerdeck .
NorPrice - Automatic multi currency display on entire catalog.
NorMatrix - Major extension to Sellerdeck implementing Colour / Size type quantity matrixes.
NorMap - Major extension to Sellerdeck implementing the Selection of a Choice from an Image Map.
Upsell - Upsell products for V6 and V7.
NorMenu, NorTree NorCascade - Cascading Drop Down Menus for V3, V4, V5, V6 and V7
Automatic Currency Converter on Prices/Extended Info
Dynamic Product Images. Dynamic changing of the product image when a radio choice or drop down list is selected.
Multi column product/brochure layout. Allows you to lay products out in any number of columns
Displaying images in the checkout phase and search results.
to see the full list go to the Drillpine site.