This is the link to the public profile of Darrell Ulm at Drupal.org listing Open Source projects, written mainly in PHP, MySQL for the Drupal content management system project.
Recently, a fellow Drupalist asked me a really good question, approximately worded: “what are the modules you are familiar.” This is a great question, and I wanted to pick some awe inspiring modules that had a 'wow-factor' but all I could think of was “link,” “devel,” but what I wanted to say was some great module that really did everything and summarized what Drupal is all about.