Bomono has you trying to corral an unwieldy set of swinging oscillating brushes across a canvas. Created by Philipp Lenssen all of the way back in 2008.
Harmony has a number of funky tools for drawing shapes and lines. The neatest of the bunch connect nearest points with an intricate webwork of fine lines. Created by pioneering WebGL and HTML canvas artist Ricardo “Mr. Doob” Cabello.