The CSLU Toolkit and accompanying tutorials are designed to provide a platform for researching and developing language technologies and systems, and to engage naïve users in using and experimenting with interactive language systems. We provide a set of demonstrations in this special session that illustrate capabilities. They include rapid prototyping of a spoken dialogue system that integrates an animated talking face, speech recognition and text-to-speech synthesis, and a variety of applications created by practitioners using the rapid application developer.