Simple responsive image gallery is a really simple, lightweight and fully responsive image gallery based on leastjs from Kamil Czujowski.
There is almost zero configuration and it works out of the box. Just select the images folder and you're good to go. It automatically generates thumbnails for all images present under selected folder to avoid HTML scaling of images.
It also supports retina/HiDPI images display. To use the HiDPI/Retina device support, you need all images in double (2x) size. Default size for thumbnails is 240px x 150px and for fullscreen 960px x 600px. It’s 480px x 300px for thumbnails and 1920px x 1200px for fullscreen images.