There are lots of goodies coming in Drupal 8. A lot of work has gone into bring Drupal up to modern web standards. In addition to digging into Drupal-specific problems, a lot of work has gone into removing some of the custom overhead we have by incorporating a number of external libraries—that is, code that other communities have created and maintain, and does not live on Drupal.org. Adding external libraries means that we are working with these other open source communities to maintain our code, and that lets us focus on the Drupalisms we need, instead of re-inventing the wheel all over the place. This is the biggest growth for exernal libraries that we've ever seen, and I decided to take a look at what we have in core now.