jturtle.jar Library of classes to draw with a turtle. You can get the latest version here

In the 1960s, an educational programming language called Logo was developed. It is best known for teaching programming with turtles! The turtles were graphical or robotic turtles that were controlled with simple commands like go forward or turn right. Here’s a photo of a robot turtle from the 1960s.

The turtle had a pen attached to it. The student-programmers would steer the robot around using simple commands to create drawings with their code.

This was later used (in a simulated state) to teach newer programming languages as they get invented. Here we have the Java incarnation of Turtle Graphics.