OpenCart - A free shopping cart system. OpenCart is an open source PHP-based online e-commerce solution.s
Zoho Inventory - Zoho Inventory is an online inventory management software ideal for small businesses. Simplify your inventory and order operations. Try for FREE!
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
Fishbowl Inventory - Fishbowl offers manufacturing and warehouse management solutions for QuickBooks.
PrestaShop - Create your online store with PrestaShop's free shopping cart software. Build an ecommerce website for free and start selling online with hundreds of powerful features.
SellerCloud - SellerCloud is a multi-channel inventory and order management system.