The Photoswipe module for Backdrop
A short while ago I ported the contributed module Photoswipe to Backdrop from its Drupal 7 version. This module uses an open source jQuery library by Dmitri Semenov to implement a gallery of images which can be swiped one by one, either to the left or to the right. With a touchscreen device this is a normal swiping action; without a touchscreen small right and left arrows can be used.