Website:
Alliance for Healthier Communities (AHC) is an alliance of health care organizations with a site built on Backdrop CMS.
Their old site was on Drupal 7 which had an end-of-life. We chose Backdrop CMS as a good fit for the member site. Backdrop CMS is a fork of an early version of Drupal 8, back when it still looked a lot like Drupal 7. The philosophy of Backdrop CMS is quite different from Drupal; one that is focused on a different niche: that of small business and non-profits that don't have the cash and ambition of large organizations.