flexible online design tool both for print and products

We are looking to have a web based design tool developed like [login to view URL], [login to view URL], [login to view URL] or [login to view URL] The tool should be built using preferably html 5, js, ajax, php or C# as it should also work on a tablet device. Should support multiple product types Should support the addition of own graphics and fonts Should provided api or code to integrate with ecommerce system User should be able to save there custom designs. Please email samples of similar work.