Few people who did not grow up speaking Zulu have learned the language later. There are limited resources for second language Zulu learning, whether textbooks, readers, or computerised resources. We set out to develop software for this purpose, to support learners' independent learning. Drawing on research on language learning, we used a number of principles that then informed the design of the programmes. In this paper, we reflect on the applicability of the principles and the difficulties in structuring an application for an agglutinative language.