Apache WS Muse moved into the Attic in January 2013. Muse was a Java-based implementation of the WS-ResourceFramework (WSRF), WS-BaseNotification (WSN), and WS-DistributedManagement (WSDM) specifications.
The user mailing list, downloads and issue tracker all remain, but are read-only. The website appears to have been removed.
As with any project in the Attic - if you should choose to fork Muse outside of Apache, please let us know so we can link to your project.
Archived versions of Muse may be downloaded from the Apache Archives.
One fork that has been created is amused, available at http://52north.org/communities/sensorweb/amused.