Tuga Turtle is a simple turtle graphics programming system I designed for my son. It uses the Ruby programming language which can be expressed in simple forms. On the plus side, Ruby is also a language used professionally for web programming and in many other fashions.

Here's an example of a simple program that draws a green square:

color green
4.times do
turn right
walk 500
endTuga Turtle can be launched as a Java Web Start application, but it uses local storage in files, so it needs user permissions.

This project is available as public domain. I've just chosen Apache License 2.0 because that was an option for hosting at Google.