PhotoSwipe - JavaScript gallery, no dependencies.
Lightbox 2 - Lightbox is a simple, unobtrusive script used to overlay images on the current page.
Fancybox - fancyapps.com - Fancy App Store
lightgallery.js - Full featured javascript lightbox gallery, No dependencies.
Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
nanogallery2 - nanogallery2 is a must have gallery and lightbox javascript library [open source]. Strengths of nanogallery2 include rich UI interactions, multiple responsive layouts, swipe and zoom gestures, multi-level albums and limitless options.