User Interface
Plugins about layout, design and visualization.
TinyMCE WYSIWYG Editor
A sophisticated HTML WYSIWYG editor control with manifold customization options, skins, and plugins.
Rainbow Syntax Highlighter
Rainbow is a very lightweight and powerful source code syntax highlighting library supporting 19 languages by default. It's used here on plainJS.
baguetteBox.js Lightbox
A beautiful and responsive lightbox for image galleries.
Linkify
Turn URLs in plain text into link tags.