Due to factors such as a small and fragmented market and rapid hardware development, the conventional textbook is inadequate for DSP lab education. Freely available open-content materials that enable and promote local customization and further development by a community of educators offer a fresh approach to lab text aurthoring that can surmount these barriers. In this paper, we will explain the Connexions system that can be used to generate content for several types of DSP lab courses. In addition, we show how Connexions is well-suited to internationalization and introduce Japanese language DSP content that has been developed in the Connexions system and is free for use at any Japanese university.