1. Owl Carousel – Lazy Load
2. Lazy Load Plugin for jQuery

Lazy Load is delays loading of images in long web pages. Images outside of viewport are not loaded until user scrolls to them. This is opposite of image preloading.
3. Unveil.js A very lightweight plugin to lazy load images for jQuery or Zepto.js
4. WordPress Lazy Load Plugin
5. jQuery Lazy – jQuery.Lazy()

A lightweight but powerful delayed content, image and background lazy-loading plugin for jQuery & Zepto
6. Be Lazy.js
7. antiblanks – jQuery LoadImages plugin prototype

A JQuery plugin to attach load listeners to images within a container and fire an event when all the images have loaded.
8. colorify.js Lazy-reveal
9. jetmartin Responsive lazy loader
10. stalactite – A jQuery Lazy Loader plugin
11. BttrLazyLoading
12. Layzr js
13. Bttr Lazy Loading-BttrLazyLoading
14. ng2 image lazy load
15. Lazy Loading Images in Ember – The Ember Way
16. Recliner-js lazy loader

Recliner is a super lightweight (1KB), jQuery plugin for lazy loading images, iframes and other dynamic (AJAX) content.
17. imageoptimzation – Lazy Loading Images
18. jQuery.latley.js-lazyloader
19. lazyYT-Lazyloader

This is a jQuery plugin to lazy load Youtube videos. On the initial load, the div will be appended by a preview img of the video. On click of the image, the preview img will be replaced by the autoplaying iframe Youtube video.