LiaScript is an attempt to enable everyone to create free and interactive online courses, without the need of being an experienced programmer. Instead, it aims to bring both parties, software- and course-developers, closer together by introducing Open-Source techniques into the Open-courSe development process. LiaScript was designed to be compatible to Common-Markdown, but it introduces lots of language extensions that deal with quizzes, surveys, ASCII-art, text2speech, animations, online programming, the integration of JavaScript, etc. as well as its own macro-system that simplifies tedious and repetitive tasks. It comes along with its own just-in-time compiler that runs in the browser and therefor does not require additional tooling. [For the full proceedings, see ED621557.]