This Geogebra demonstration is pretty amazing for obtaining a more intuitive understanding of Lorentz transformations. However, it has its limitations. If it would allow the user to add worldines and see how they transform, use the other sectors of the graph and return coordinates with more significant figures it would be a seriously powerful tool for the beginner wanting to get a better grasp of problems in special relativity. Are there similar resources that allow one to do these things? If not, how would you suggest I go about creating one?