TurtleOS
From ComputerCraft Wiki
TurtleOS is the default OS for turtles. The difference with the default OS for consoles is that TurtleOS works with the new [[Turtle API], which can be used to code turtles. Its features include...
- Default; guaranteed to work across updates unlike the others.
- DOS style interface
- Only OS for turtles at time of writing
- Do It Yourself: letting you customize what you want on your Turtle.