As far as the North East is concerned, collaboration is chief among them. This may explain why this part of the world. The Mile High City will host about 3,000 “Drupalers” this week for a three-day geekfest. Drupal, free and open-source software that powers websites such as Twitter, eBay and Whitehouse.gov, will be the focus of DrupalCon, which will. Imbeault built the site on top of the Drupal open-source content…