Live Price PRO - improved version of the Live Price module, which allows additionally to set global discounts and specials, to set discounts and specials in percentage and has more useful pricing features.
Related Options -to create combinations of related product option values and set stock, price, model etc. for each combination. It's useful for sales of products, having interlinked options, such as size and color for clothes (recommended to use with Live Price module).
Related Options PRO - improved version or Related Options module, which allows to create different combinations of options values per one product.
Parent-child Options - to show/hide child options (option groups) depending on selected values of parent options.
Product Option Image PRO - to assign images to options (or options to images) and change main product image and list of additional images on product page depending on selected options (allows to set several images per option value).
Product Option Image Ultimate - to improve option image functionality making the administration work easier (selecting many images at once, simple sort order for options images, setting images for combinations of related options, etc.)
Improved Options - to set Model (product code), SKU, UPC, description for product option values and to select default option values.
Quantity per Option - to display separate "Quantity" inputs for option values and to add all variations (product+option) to the shopping cart in one click.
Contact for support, questions and suggestions: firstname.lastname@example.org