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.

tysonlt

Helps Shopp integrate with caching plugins. Currently designed for W3 Total Cache, but the cookie strategy will work for any cache plugin that monitors cookies. 
Other caching plugins will require manual configuration, but W3 Total Cache is configured automatically. * Automatically integrates with W3 Total Cache to configure caching settings – no other configuration is required! * Automatically configures common Shopp paths that should not be cached (W3 Total Cache only) * Sets a cookie whenever the cart is updated. If the cart becomes empty the cookie is purged. 
* Sets DONOTCACHEPAGE constant on ‘init’ action to make sure that pages with shopping cart items are never cached. * Clears the cache when product, category etc. details are changed.

Shopp Cache Helper

Helps Shopp integrate with caching plugins. Designed for W3 Total Cache, but will work on any cache plugin that checks for custom cookies.

Shopp Improved vs Shopp Cache Helper