This article aims to describe a number of software tools designed for the preparation of computer‐aided learning materials (CAL) in mathematics. The CALM Project, based in the Mathematics Department of the Heriot‐Watt University in Edinburgh, is one of the projects currently receiving funding from the Computer Board of the United Kingdom as part of the Computers in Teaching Initiative within British universities. This paper will explain the features of software design favoured by the CALM Project team and it will deal not only with CAL in mathematics but also with CAL in general. The CALM Project provides a practical example of software development in the programming language of Pascal within an educational environment.