Barry Hughes

This plugin works with and depends upon the Shopp e-commerce plugin for WordPress. It is designed to integrate with the 1.2.x branch of Shopp and has been successfully tested with Shopp 1.2.1.
Enough of that, what does it do?
<ul>
<li>Shopp already ships with a widget that can be used to display product categories. This is an alternative to that widget.</li>
<li>Select only those categories that you wish to include, ignore the rest.</li>
<li>Easy to use: simply check the boxes for the relevant categories, choose the display mode (dropdown, regular list etc) and you’re done.</li>
<li>A convenient way to build category-based store menus in the sidebar!</li>
</ul>
This plugin was written by <a href="http://freshlybakedwebsites.net" rel="nofollow ugc">Barry Hughes</a> and can be supported by <a href="http://freshlybakedwebsites.net/say-thanks-with-a-beer/" rel="nofollow ugc">buying the author a beer</a>.

Shopp Custom Categories Widget

Provides an alternative category widget featuring fine grained control for use with the Shopp plugin.

Shoppdeveloper.com

With this plugin installed you can supply your customers with previous/next buttons on the product pages of your Shopp webshop. They will no longer have to go back and forth between category/catalog pages and product pages when browsing a category. You can translate the plugin to your own language, .pot file is included. Dutch language files are already present.
The difference between this plugin’s output and the regular Shopp ‘next,previous’ output is, this plugin’s output will stay inside the chosen categorie. So if your customer is looking at a lamp, browsing the category ‘Yellow’, the next product will also be in the category ‘Yellow’ and not just another product in for example the category ‘Lamp’.
By use of the Shopp tag <code>shopp('product','browser',"show=both&cat=$cat")</code>, you set whether you want to display ‘previous’, ‘next’, or ‘both’. Take a look at the more detailed instructions below.
By use of the settings page, you specify
<ul>
<li>the phrases used for ‘Previous’ and ‘Next’</li>
<li>to use product thumbnails instead of ‘Previous’/’Next’</li>
<li>the size of the thumbnails</li>
<li>to use predefined Shopp image-setting</li>
<li>which categories to exclude (‘Previous’/’Next’-buttons will not appear on those Shopp product pages)</li>
<li>which products to exclude (‘Previous’/’Next’-buttons will not appear on those Shopp product pages)</li>
</ul>

Shopp Product Page Browser

Add "previous/next"-product links to your Shopp webshop's product pages.

Shopp Custom Categories Widget vs Shopp Product Page Browser