While natural language as an interaction modality is increasingly being accepted by users, remaining technological challenges still hinder its widespread employment. Tools that better support the design, development and improvement of these types of applications are required. This demo presents a prototyping framework for Spoken Dialog System (SDS) design which combines existing language technology components for Automatic Speech Recognition (ASR), Dialog Management (DM),and Text-to-Speech Synthesis (TTS) with a multi-step component for Natural Language Understanding (NLU).