FusionInvoice - Self hosted invoicing for freelancers and small businesses
Zoho Inventory - Zoho Inventory is an online inventory management software ideal for small businesses. Simplify your inventory and order operations. Try for FREE!
Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
TradeGecko - TradeGecko (now QuickBooks Commerce) is inventory management software for ecommerce and wholesalers - simplify your inventory & order operations with powerful inventory management, multichannel selling, inventory reports and more!
Bahaquote - Bahaquote offers complete online invoicing and billing software designed to seamlessly integrate with any business.
Fishbowl Inventory - Fishbowl offers manufacturing and warehouse management solutions for QuickBooks.