TUIO is an open framework that defines a common protocol and API for tangible- and multitouch-surfaces. The protocol is based on Open Sound Control and allows the platform-independent encoding and transmission of an abstract description of interactive surfaces, including touch events and tangible object states. While the original TUIO specification has been implemented for various hardware and software environments, there are not as many feature complete reference implementations of the next TUIO generation, although its specification [2] has been finalized and partially implemented by community members. The TUIO Hackathon at the International Conference for Interactive Tabletops and Surfaces is addressing expert users and developers of hardware and software environments for surface-based tangible user interfaces that are interested in experimenting with this new framework, with the goal of initiating the development and integration of new TUIO implementations.