My thesis is about thin-client application development by modern web technologies like Google Web Toolkit and JavaFX. This semester I successfully developed a rich internet application, which can be used by students of the university. The application aims to support a course called Android-based software development and ease the work of instructors at AMORG department. Students can upload solutions for home assignments easily via web interface and they can also check their evaluation there. Instructors can manage semesters, groups, and submitted assignments via their specified web interface. The evaluation process is also simplified by a service which installs the applications belonging to submitted assignments to the mobile phone. This way the evaluation process is accelerated.