We have recently been toying with the Drupal API module in an attempt to set up our own Drupal API documentation site just like Lullabot did. As of today we have managed to set up something that is fairly functional and somewhat similar to the Drupal.org documentation site. Check out our own Drupal API reference site.
Drupal uses a reasonably powerful mechanism to create, prepare and send emails generated within the system. We maintain two modules related to emails in Drupal - Mail Merge and MailQ (Mail Queue) - and get the opportunity to work with the mail subsystem in Drupal. Here is a brief write-up on how the mail system works in Drupal.
Broken Link Checker
Broken Line Checker is a Wordpress plugin that will check your posts, comments and other content for broken links and missing images, and notify you if any are found.
Bad Behavior
Bad Behavior prevents spammers from ever delivering their junk, and in many cases, from ever reading your Wordpress site in the first place.
WP Security Scan
Security Scan is a Wordpress plugin that scans your WordPress installation for any security vulnerabilities.
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MapPress Easy Google Maps
MapPress is is the most popular and easiest way to create great-looking Google Maps and driving directions in your Wordpress blog.
Lightbox Plus
Lightbox Plus is a Wordpress plugin that permits users to view larger versions of images, simple slide shows, videos and content all in an overlay. It uses the popular colorbox jquery plugin.
WP- DB Backup
WP-DB-Backup is a Wordpress plugin that allows you easily to backup your core WordPress database tables. You may also backup other tables in the same database.
WP e-Commerce
WP e-Commerce is a free WordPress Shopping Cart Plugin that lets customers buy your products, services and digital downloads online.