Fotorama

It's simple and powerful jQuery gallery by Artem Polikarpov. Homepage of the plugin — fotorama.io. Demo:

Photos by Andrey Okonetchnikov

highlight.js & prism.js

The best syntax highlight libraries. First of them has more themes, but sometimes second works better. Which one to use? Up to you.

Homepages: highlightjs.org & prismjs.com. Demo of prism.js you can see below.

@import 'mixins';
@import 'variables';

//- Basic

html {
  font-family: font('sans');
  font-size: 100%;
  line-height: size('line-height-max');
  background: color('secondary');
  color: color('primary');
  -webkit-overflow-scrolling: touch;
}

ZOOM.JS

It's a pure JavaScript image zooming plugin; as seen on Medium.com. Check the demo below (click to the image). Homepage.