CSSFX is a collection of CSS effects with previews and very simple implementation instructions. Just click on the effect demo that you like, and a popup with HTML and CSS code snippets will appear, ready to be used on your site.
percollate is a command-line tool to convert web pages into PDF files. It supports single-page and multi-page files, can fetch the HTML documents from the web, understands accelerated mobile pages (see AMP), and even allows some control of the output with CSS snippets.
For anyone who needs an image gallery or any scrolling list for that matter, Glider.js looks like a good option. It’s super simple to use, light, responsive, and dependency free. Have a look at some demos here.