The goal of the Multi-Platform Application Toolkit (MPAT) is to open up the emerging possibilities of hybrid TV to content producers, by providing an easy-to-use authoring tool for the creation of interactive multimedia applications. The project is on the one hand focusing on delivering essential tools to create basic applications while on the other hand the system can be expanded with 3rd party plugins to enlarge the functional possibilities and also templates to enhance the visual and navigational experience. Motivated by a WordPress-like technical and business approach, MPAT makes application development affordable and sustainable while creating a new eco-system for content creators, theme and plug-in developers alike.