Picular - Google, but for colors.
VectorWiki - A huge repository of ~120K brand logos in SVG format for free and quick download.
Get waves - A simple web app to generate svg waves, unique every time
Brands of the World - Open source database of brands vector logos
Color Palette Generator - Enter the URL of an image and find its color palette
BonsaiJS - A lightweight graphics library with an intuitive graphics API and an SVG renderer.