Blender is an exceptional graphics programme based on the python programming language. It allows users to generate high quality images that have featured on the covers of several journals. Once again it’s freely available and can be downloaded here, although this does require the latest version of Python to run, which you can download here.
Blender has some excellent tutorials on their website which do a very good job of explaining the basics and getting you started.
Click on the image below to see some examples of what Blender is capable of – it will take you breath away!