I will start by saying I like to use the right tool for the job when the option is available.

The Atlasssian guys agree with that approach: https://www.cmscritic.com/atlassian-chooses-magnolia-cms-for-groundbreaking-product-training-website/

Drupal is a CMS (Content management system) / WCM (Web content management) system while Confluence is an enterprise collaboration and wiki platform.  Sure there is feature overlap but the product goals are different.

Though I’m a fan of products that run on the Java Platform, one cannot deny the popularity, ecosystem, and success of technologies like PHP for web content management.

I’ve deployed several successful sites on Drupal technology and so has Acquia (The creators of Drupal).  However, I like to make data driven decisions as experience (including my own) can bias choices.

Some points of research:

• Analyst reviews:
  •  Acquia Named a Leader in new Gartner WCM Magic Quadrant and Click here to learn why Forrester named Acquia a leader in the social platform marketplace
• Who is using Drupal:
  • https://www.acquia.com/customers
  • https://www.acquia.com/resources/case-study
  • http://www.zyxware.com/articles/4351/list-of-fortune-500-companies-using...
  • https://www.drupal.com/showcases
  • http://topdrops.org/# (Click the link “About TopDrops.org”)
  • https://www.drupal.org/case-studies

Ecosystem / Community (Very strong): https://www.drupal.org/

I also evaluated the latest versions of Joomla, Wordpress, HippoCMS and few others.  The total offering of Drupal/Acquia/Community/Ecosystem led to the selection of Drupal.

This site is currently at its initial version and infancy.  It will evolve in feature, function, and aesthetics.  Success one is getting it launched.

More to come...