👑 Functional WebGL
Backstretch is a simple jQuery plugin that allows you to add a dynamically-resized, slideshow-capable background image to any page or element. The image will stretch to fit the page/element, and will automatically resize as the window/element size changes.
2D physics engine for games
Jcrop (official) - Image Cropping Plugin for jQuery
qrcode generation standalone (doesn't depend on external services)
Simple & lightweight responsive slider plugin (in 1kb)
Responsive images while we wait for srcset to finish cooking
Featherlight is a very lightweight jQuery lightbox plugin. It's simple yet flexible and easy to use. Featherlight has minimal css and uses no inline styles, everything is name-spaced, it's completely customizable via config object and offers image, ajax and iframe support out of the box. Featherlights small footprint weights about 4kB – in total.