From Joe Stenger and Arlo Rose:
Scheme Factory is the official scheme editor for the Kaleidoscope 2.0 scheme format. Whether you're a novice schemer or a seasoned professional, Scheme Factory offers you the tools you need to make Kaleidoscope 2 schemes quickly and easily. You'll find that Scheme Factory offers a clean and easy to use interface allowing you to create schemes as quickly as you can draw the elements for your scheme. Scheme Factory is built with Apple's Human Interface Guidelines in mind, so you can count on it to work the way you expect a Macintosh application to work.