This library is for turtle graphics implemented in R7RS Scheme. Because there is no portable way to implement graphics, the code was made modular enough to have multiple front-ends. For Gauche, gauche-tk is used. For Kawa, the built-in HTTP server is used to send instructions to a browser front-end.
There is also effort to unify the use of the web front-end for multiple implementations.
YASOS is a dependency to allow extending the turtle.
Here is a picture of the "dragon" curve.
You may redistribute or modify this library under the terms of the GNU GPLv3, or any later version. See LICENSE for details.