It hasn't kept it for itself, it is still submitting patches and releasing new versions. The toolchain is no longer supported, but Apple also provides patches to the open-source toolchain.

Lots, lots more at http://www.wocommunity.org/page/default but as others have said -- this is essentially a (very nice) Java framework with some Eclipse tool support.

What I really miss is the Objective-C framework, with EOF, and native Mac tools, bindings etc.