18 cool Drupal 8 modules for site builders

Joris Snoek gives us his top list of Drupal 8 modules for site builders:

Furthermore, what I noticed last month on module updates: ... Validating a form in your Drupal website without refreshing the page. This widely used module now offers a Release Candidate for Drupal 8.

Useful list, even for Drupal 7 builders.