Kartris is a free, open-source e-commerce platform with a responsive interface for mobile and tablet support. It is based on ASP.NET 4.0 (web forms). It supports unlimited languages and currencies and handles over a million SKUs and hundreds of orders per day out of the box. Full-text search with keyword relevance sorting is built-in, ensuring visitors can find products almost instantly even in huge catalogues. There are a variety of different product types (single version, multiple version, options and combinations). There is also support for completely customized product configurations - you can build your own product configuration control that can accept dimensions, calculate pricing (or look it up from a spreadsheet table) and add the product to the basket. A wide range of payment plugins are included such as Paypal, AuthorizeNet SIM & AIM and Sagepay. Bitcoin is also supported natively - Kartris can connect with a Bitcoin client via a JSON API, so you don't need any third party service providers to accept Bitcoin and have orders flagged as paid. There are free apps (Android widget and Windows app) to notify you of orders and new support tickets while on the move. A free data tool provides ways to import data from spreadsheets and older versions, import/export language packs and reset admin passwords. It can also be used via command line, so scripted daily data updates (including product image updates) can be fully automated as scheduled tasks.