If you want to show website previews in Drupal-based sites, there is a ShrinkTheWeb module that supports quite a few PRO features as well as the Free service. The link is below in the post by George, the original developer, and we post a link on our plugins page.
As of 02/01/2016, we have taken over development of this project and the "Website Screenshots" Drupal module.
Best regards,
Brandon