In our latest release, Thunder 1.2, we fixed some bugs which prevented testing the distribution with simplytest.me. Now you can have a quick glance at Thunder on simplytest.me/project/thunder
Furthermore, we also added a security update for the Linkit module that provides an easy interface for external and internal linking. You can download the latest version of Thunder here: https://www.drupal.org/project/thunder
We already shipped a security fixed core version with Thunder 1.1 one week ago. We also improved the guided tour to give new users a better overview about the functionalities of Thunder.