The current Apache Wave code base is a vast complex tangle (GWT wasn't the right decision, I doubt web sockets was either), and there's virtually no life on the developer list.

To be in any way seriously useful, this should be reimplemented as from scratch with a strict separation of UI and wave server back end, with a massively simplified deployment process. (Go would be a good choice imho).

The ideas behind wave are interesting, but the technical debt that Google dumped out when they abandoned wave is so massive, I consider the current wave code base a completely lost cause.

Seriously; interested developers drop into the mailing list form time to time; look at the code base, then run screaming. The reports barely even get done.