Squeak Etoys is a "media authoring tool"-- software that you can download to your computer
and then use to create your own media. You can write out your project and share it with others.
Etoys runs on any Mac or Windows machine, as well as on the OLPC XO machine.
It is free.
Find out about Etoys.
Text of this guide (for searching): Paint Tools: Perfect Ellipses and
Circles with a Clean Edge Tool. Open a paint palette from your
Navigator Bar then click the white tab to open the clean edge tools. Select the Ellipse tool and then choose a brush size. Try all six sizes. Hold down the Shift key on the
keyboard and use the Ellipse tool
to draw perfect circles.