All Ucommerce Accelerators are open source, these are used to install and setup a demo store on Ucommerce, so you can see how Ucommerce works, and get some ideas of how to use Ucommerce.
You can download the Ucommerce Umbraco Accelerator here.
You can download the Ucommerce Sitecore Accelerator here.
You can download the Sitefinity Accelerator on Nuget.
The code should be mostly used as a starting point, and is not a plug and play solution.