The objective of the Artcast4D project is to develop a technological framework and tools that will unleash the potential of EU CCIs for designing and developing cost-effective, non-invasive, immersive and interactive users experiences. Using both academic and industrial approaches, it relies on theoretical and experimental research, open source software and hardware development together with challenging case studies and onsite beta testing implementations. The innovation lies in the ability to create immersive environments in open spaces, with minimally intrusive projection technology, on the capability to design interactive applications with crowd movement and sensing capabilities, and on the open source availability and ability to extend the solutions.