It's not free, like the options below, but it's the best tool money can buy. Open source vector graphics package Inkscape is staggeringly powerful, and is the best free Adobe Illustrator ...

An integrated electro-optic frequency comb that combines microwave integrated circuits with a photonic circuit based on lithium tantalate leads to broadband operation with low power requirements.

This is meant to be a fairly complete way to dump an entire SVG document in, and get a set of Bezier curves out. SVG has a lot of features, including things like colors, line weights, masks... many of ...