Derive is a computer algebra system developed and marketed by the Soft Warehouse company. Magiera thinks that it has been unfairly overlooked in favour of glitzier software, and that the existing literature on it describes only purely mathematical and abstract problems, without recognising its utility to deal with a wide range of problems in physics. He demonstrates how to work out problems that are often encountered in undergraduate General Physics courses, and some that would also be suitable for high school. He says the software is very cheap, so simple that it can run on pre-Windows.