Here are some useful ZenCart mods. Mods are kind of like plug-in software pieces that you can install to extend the functionality of ZenCart. 

Prior to install mods, it is recommended that you look through the support threads to see if there are any incompatibilities issues that people might run across. For example, at the time of this writing, the Simple SEO URL mod will cause PayPal IPN to not work which is a serious defect.  This was not mentioned in the install docs, but was seen in the support thread.

Quantity Discount Mod

Download here »
Allows discount in percentages or dollars if user purchase more than a certain quantity on a per item, per total items, or per category basis.

Group Pricing by Item

Download »
forum thread »
Different groups of users will see different prices (if they are logged in). Can handle up to four groups. In the product entry, it adds separate additional price fields so that you can enter different prices for each of your products for each of your group. This can be used for wholesaler group and retail group.

Dual Pricing - WholeSale Pricing

Download »
Similar to Group Pricing by Item in concept. But different in its implementation. It adds one extra price field for each product entry. But you can enter up to four price levels in that one field as long as you separate it with the specified delimiter.

Backup MySQL Plugin

Download here »

Allows you to backup your MySQL database via the admin interface.

Admin Profiles

Download here »
Allows you to restrict access to certain parts of the admin interface for certain users.
Wiki and forum thread

Cross Sell

Download here »
Enables the display of related products.

Checkout Without Account

Wiki

Fast and Easy Checkout

Download here »
support thread here »
If you want to skip the checkout shipping page because your product is vitural, you can set that for individual products.

Faux Slimbox (Lightbox)

Download here »
Support thread here »
Example here »

Zen LightBox

download here  »
support forum thread »

Google Sitemap

Google Sitemap module generates XML sitemaps that you can submit to search engines.

Apple Zen Template

download here  »
support thread »
Example »

This free template includes horizontal drop down category menus.

Swap Images

download here »
Can be used to provide alternate views of your products.

Image Handler 2

download here »
support thread »
documentation »

Uses the GD library to resize your uploaded images to create small, medium, and large images size. Having the right image size on your page instead of the large uploaded image will improve performance of your page loads. This mod includes the nice hover zoom effect as seen in the Cherry Zen Template which is also available for download here.

CSS Horizontal Drop Down Menu

download here »
support thread »
example »

Local Sales Tax

download here »
support thread »

Enables different sales tax to be charged when shipping to different districts within your state.

Dynamic Price Updater

Forum thread and download here »

Updates the price when drop-down attributes are selected. Not sure if it updates the price if user goes directly to the page when attribute is already selected.

Categories with ezpages links & TOC

Download »

It adds your ezpage links to the bottom of your category box.

Improved Attribute Controller

Download »

Makes the second attribute droplist be dependent on selection of first droplist.

Blue Buttons by Kuroi

Download »

Blue buttons to replace the default zencart buttons. If you are stylizing buttons, you might want to do the following buttons as well: button_create_account.gif, button_delete_small.gif, button_continue_checkout.gif, button_logoff.gif, button_return_to_product_list.gif, button_confirm_send.gif, and templates/yourtemplate/images/icons/small_delete.gif

Commercial Mods

Magic SEO URL »