dashCommerce is an ASP.NET open source e-Commerce application.

Features:

Inventory Control
– Per Product Inventory
– Per Product Option / Attribute Combination Inventory
– Quick and Easy Inventory Management
Checkout / Order Management
– Order Messages / Email Notifications
– Configurable Tax Rates
– SSL based checkout
– Order Status Change Email Notifications for Customers
– Shipping Tracking
– Drop-In Configurable Tax Providers
– Drop-In Configurable Shipping Providers
– Drop-In Configurable Payment Providers
– Drop-In Configurable Coupon Providers
– Configurable Handling Fees

Supported Providers
– PayPal
– SimpleWeight Shipping Provider
– RegionCode Tax Provider
– Mettle Systems Tax Provider (Real Time, tax tables are updated monthly)*
– USPS (Real Time)*
– UPS (Real Time)*
Other Features
– Content Management
– Extensive Site Settings
– Widgets
– Drop-In Themes / CSS
– Fully Localizable