1)   osCommerce Manager 3.9.5.1108
Manage osCommerce products, osCommerce product attributes, categories, manufacturers, orders, batch updates - export osCommerce products to Excel, and import products to osCommerce, import file from your supplier, easy populate and product attributes

 2)   QInvoicing 5.50
Complete invoicing software that integrates all your osCommerce on-line shops. Qinvoincing allows you to automatically fill up your osCommerce on-line shop as well as download all data you have in your osCommerce.

 3)   Excel Populate for Oscommerce 1.0
Excel Populate (Excel Export/Import, Excel Oscommerce Manager, Advanced Easy Populate) is contribution to manage (add, edit, delete) main Oscommerce components like products, products attributes, categories, manufacturers via Excel file