The Wizard of Oz (WOZ) method has been used for a variety of purposes in early-stage development of dialogue systems and language technology applications, from data collection, to experimentation, prototyping and evaluation. However, software to support WOZ experimentation is often developed ad hoc for specific application scenarios. In this paper we present WebWOZ, a web-based WOZ prototyping platform that aims at supporting a variety of experimental settings and combinations of different language technology components. We argue that a generic and distributed platform such as WebWOZ can increase the usefulness of the WOZ method.