Ass-ons : 25 Free SEO Add-ons for Drupal, Joomla and Wordpress

Drupal, Joomla and Wordpress are very popular and powerful content management systems. They are all written in PHP, support the MySQL DBMS and are built on a modular architecture that allows for extending them with additional functionality.

There are hundreds of free add-ons (modules, components, plugins) available for each of these three systems. Some of them are especially useful when it comes to optimizing your website for search engines.

Below you find a selection of such SEO related add-ons for Drupal, Joomla and Wordpress listed in alphabetical order, including tools for search engine friendly URLs, meta tag generation, social bookmarking services, performance tuning, user tracking and statistical analysis. Add-ons related to search engine friendly URLs usually require mod_rewrite to be enabled on your Apache web server.

Have fun playing around with these tools and bear in mind that none of them is a replacement for the most powerful SEO technique, which is creating valuable content.

Drupal Modules

1. Block Cache creates cached versions of each block displayed on your website. For each cached block only one SQL query is executed thus reducing server load resulting in better performance and faster delivery of content.
2. Find URL Alias is a utility module that lets you search for particular URL aliases. This module requires the core path module which enables search engine friendly URLs for your site. Find URL Alias is especially useful when there are many aliases stored in your database. But keep in mind that changing URLs is something you should avoid.
3. Google Analytics integrates Google's powerful web statistics tracking system with your website. The module enables you to selectively track users by role.
4. Meta tags allows you to define site wide meta tags and specific tags for each piece of content (node). If you use the core taxonomy module (you really should do) meta tags can be assigned automatically by using the terms (tags) you use to categorize your content.
5. Pathauto automatically generates path aliases based on the modules settings. A very powerful module that lets you define different URL patterns based on content types. In the latest version also allows to filter common words. Requires the core path module.
6. RobotsTxt is useful if you run multiple Drupal sites from a single code base and want to have different robots.txt files for each of them.
7. Service links automatically adds links to social bookmarking and blog search services to your content. You can select which services you want to link to, restrict the display based on content (node) types and whether to display links in teaser and/or full page view.
8. URLify automatically generates the path alias for a piece of content based on its title using JavaScript. Requires the core path module. I lightweight alternative to pathauto.
9. XML Sitemap generates an XML sitemap which complies with the sitemaps.org specification. The relative priority of each piece of content is calculated based on content type, number of comments, and promotion to front page. The values of each of these factors can be set in the admin section of the module.

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Courtesy : Seo-expert-blog.com