Canvas Based Interactive Gradients Animation Library – Granim.js
Granim.js is a lightweight, dependency-free JavaScript library which helps create configurable, interactive gradients animations on an HTML5 canvas element.
JavaScript & CSS Gradient
180+ Gradient Colors In Pure CSS3 – webgradients
webgradients is a lightweight CSS library which provides 180+ linear-gradient colors for backgrounds, text and anywhere you want.
Pure JavaScript Smooth Gradient Generator
A pure JavaScript library that allows you to draw smooth gradients on Html5 canvas element.
Animated Gradient Background with Pure CSS
An animated gradient background using CSS3 box-shadow property and keyframe animations, written in LESS and created by blucube.