8 Essential E-Commerce Drupal Modules You Can't Live Without

Drupal and e-commerce are a match made in heaven. But did you know that to get the full power and functionality of Drupal for your online business, there are some essential modules you need to install? Read on, as we present our top 8 essential e-commerce modules for Drupal.

1. E-commerce: this one is a no-brainer, and in fact, you probably already have it. E-commerce is basically a set of small modules that dramatically extend Drupal's commerce-related functionality, making it easy to set up a shopping cart, checkout pages, and product pages, as well as to calculate balances, taxes, and discounts. In addition, ecommerce helps you manage your inventory and product listings and can create powerful reports, order histories, and summaries. You should keep in mind, however, that ecommerce was at its most powerful for Drupal 5.x; for 6.x, ecommerce has been purged of some of its little-used features, some of which have become stand-alone modules.

2. Ubercart: especially with the impending demise of ecommerce, Ubercart has emerged as a powerful package of features that you just can't get by any other means. Ubercart is composed of an innovative set of features. First, Ubercart makes it a snap to create product listings and interactive catalogs. Classify and organize products automatically, as well as track stock with the click of a button. Of course, generating detailed reports for your stock and products is also simple. Second, Ubercart helps you administer, process, and track orders, as well as to process payments. Finally, there are a number of innovative features that can help you configure the store website of your dreams, including many customizable options to set up your shopping cart and checkout pages. It should also be mentioned that there are many Ubercart add-ons that extend the core package in useful ways that may be of interest as well, so you may want to check them out.

3. Invoice: this is a nice little module that, as the name implies, generates invoice nodes. The advantage of using invoices as nodes is that they can have their titles auto-generated by Pathauto and also easily be displayed in PDF (using dompdf) or HTML print mode. You can easily customize the way the invoices look by setting up templates, and it's a breeze to use several different templates for your store if desired.

4. Barcode: this module works with CCK to create a barcode field. Barcodes can be generated automatically using any symbology you choose. Customize the font or display your barcode as plain text if you wish.

5. Amazon Store: if you're going to be selling through Amazon, you'll need this essential module that implements the Amazon Associates Web Service. It's incredibly simple to use -- simply install and activate the module, contact Amazon for your personal Associate ID, and then set up your shop using intuitive tools for product pages and shopping cart. Selling items is simple and hassle-free, and you'll earn money on a commission basis.

6. Adsense: this module is a must if you're going to be generating any kind of ad revenue through your site. As you may know, Google's Adsense is an easy way of generating revenue from your site traffic without having to lift a finger. With the Adsense module, you can set up, configure, and administer Adsense advertising, as well as track your revenue and site traffic in detail.

7. SEO Checklist: like many ecommerce merchants, you may be trying to increase traffic on your site, and the best way to do this is through SEO or search engine optimization. SEO can be fairly complex, but fortunately, this module will set up a checklist of tasks to tick off to optimize your site. It also examines the other modules you've installed and make sure you have everything you need to start the search engine optimization process.

8. Currency Exchange: this is a simple module that you just can't do without. It does just what it sounds like -- allows you to post currency exchange rates on your site. This is an especially useful module if you will be doing a lot of international sales, because shoppers will need to evaluate your prices using their own national currency.