It relies on the Processing-based Wiring-derived Arduino-like IDEs for the chain-tool and the core libraries. Because embedXcode is based on a modular set of makefiles, adding the support for a new board just requires installing the corresponding IDE and adding a specific makefile.
Those makefiles can also be used with other IDEs. I tested them on NetBeans successfully.
Documentation, features, tutorial and download are available at embedXcode.webbly.com.