This short paper reports on recent advances in the development of an open-source prototyping platform for the creation of distributed and embedded musical systems based on Web technologies. The proposed architecture is based on user-grade hardware and open-source software and aims at fostering rapid-prototyping and experimentation in the context of colocated distributed systems for musical research, creation and performance. After a short review of related works, the paper describes the general design and the different building blocks of the system. Then, it exposes a first characterization of the proposed design, and concludes with the description of a prototype that highlights different features of the platform.