Lightbox 2 - Lightbox is a simple, unobtrusive script used to overlay images on the current page.

PhotoSwipe - JavaScript gallery, no dependencies.

lightgallery.js - Full featured javascript lightbox gallery, No dependencies.

Fancybox - fancyapps.com - Fancy App Store

Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.

Shadowbox - Shadowbox.js is a plugin that has user-friendly functions and allows to view media files like images, gif, video on the current page in the full dimensions