27. Composer: Dependency manager
Guzzle: HTTP Client
Assetic: Asset manager (CSS and JS aggregation)
PHPUnit: Testing
PSR/Log: Consistent logging from components and Drupal
Other components
28. This article was inspired by other
nice articles:
Drupal 8: What You Need to Know by Wayne Eaker
http://wayneeaker.com/blog/2013/10/12/drupal-8-what-you-need-know
Tutorial: Drupal 8 Site Building preview - Less is more by Heather James
http://www.acquia.com/blog/tutorial-drupal-8-site-building-preview-less-more
From Not-Invented-Here to Proudly-Found-Elsewhere: A Drupal 8 Story
https://prague2013.drupal.org/session/not-invented-here-proudly-found-elsewhere-
drupal-8-story
Drupal Community Documentation
https://drupal.org/developing/api/8
And many others...