JamSpace
Collaborative web-based audio workstation
... is modeled after typical multi-track composition software. The backend is a java application which is controlled by REST APIs and uses WebSockets for streaming audio in and out.
The JamSpace server supports both sampled and synthesized audio which may both be used in the same project. Standard MIDI and audio files may be imported.
The JamSpace server will include features for social network that will enable users to form project groups and control access to projects.