Apache Felix is a community effort to implement the OSGi R4 Service Platform and other interesting OSGi-related technologies under the Apache license.
Apache Sling web application framework (provides REST-based request resolution) that use Jackrabbit for JCR
The OSGi Alliance is a non-profit corporation founded in March 1999.
The alliance provides specifications, reference implementations, test suites and certification to foster a valuable cross-industry ecosystem.
Modularity reduces software complexity; OSGi is the best model to modularize Java. The OSGi technology facilitates the componentization of software modules and applications and assures remote management and interoperability of applications and services over a broad variety of devices