Aaron D. Campbell

Shopp Improved is a plugin that extends the popular 
<a href="http://shopplugin.net/" rel="nofollow ugc">Shopp eCommerce solution for WordPress</a>. 
You must have the <a href="https://shopplugin.net/store/" rel="nofollow ugc">Shopp 
Plugin</a> in order to use this plugin.
I recently worked on a site where I used the Shopp WordPress plugin to set up 
E-Commerce. The first big issue that I ran across was allowing for user 
customizations of products. For example, if a product can be engraved with a 
name, includes the person’s initials, can include a message, etc. Shopp does 
include the ability to add these kinds of user input fields, but it’s done 
through a template tag. This means that you either have to apply it to all 
items, or you need a developer to set it up on a per-product basis. My client 
has quite a few products that are custom-made, and they really needed to be able 
to set up these fields themselves.
In comes Shopp Improved. It creates a user interface to allow you to easily add 
these fields to any product. The inputs can then be easily integrated into a 
shopp product template with just a couple lines of code.
Requires PHP 5+.

Shopp Improved

A related posts plugin that works quickly evenShopp Improved is a plugin that extends the popular Shopp eCommerce solution for WordPress.

Shoppdeveloper.com

By default the Shopp breadcrumb will display “the path you followed to get here”. And frankly, that is 
what breadcrumbs are meant to do. However this means when someone enters one of your product pages using 
a direct link, the breadcrumb will be empty. It will just show the link back to the main Shopp page. 
With this plugin installed you can use breadcrumbs that show “where you are” in the hierarchical 
structure of categories.

Shopp Default Breadcrumb Extender

Add hierachical breadcrumb to your Shopp webshop product pages.

Shopp Improved vs Shopp Default Breadcrumb Extender