peaberry is a free and open source extension library for Google-Guice that supports dependency injection of dynamic services.
peaberry provides OSGi integration out of the box, and has plug-in support for other registry-based service frameworks.
peaberry ships as an OSGi bundle that can be dropped into any R4 framework, such as Apache Felix or Eclipse/Equinox. You can also use peaberry outside of OSGi.