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Open Source OSGI Framework

Apache Felix


Felix is a community effort to implement the OSGi R4 Service Platform, which includes the OSGi framework and standard services, as well as providing and supporting other interesting OSGi-related technologies. The ultimate goal is to provide a completely compliant implementation of the OSGi framework and standard services and to support a community around this technology. Felix currently implements a large portion of the OSGi release 4 specification, but additional work is necessary for full compliance. Despite this fact, the OSGi framework functionality provided by Felix is very stable.

OSGi technology originally targeted embedded devices and home services gateways, but it is ideally suited for any project that is interested in principles of modularity, component-oriented, and/or service-orientation. OSGi technology combines aspects of these aforementioned principles to define a dynamic service deployment framework that is amenable to remote management. As an example of a simple use case, Felix can be easily embedded into other projects and used as a plugin or dynamic extension mechanism; it serves this purpose much better than other systems that are used for similar purposes, such as Java Management Extensions (JMX).


Eclipse Equinox

From a code point of view, Equinox is an implementation of the OSGi R4 core framework specification, a set of bundles that implement various optional OSGi services and other infrastructure for running OSGi-based systems.

More generally, the goal of the Equinox project is to be a first class OSGi community and foster the vision of Eclipse as a landscape of bundles. As part of this, it is responsible for developing and delivering the OSGi framework implementation used for all of Eclipse. In addition. the project is open to:

  • Implementation of all aspects of the OSGi specification (including the EEG, MEG and VEG work)
  • Investigation and research related to future versions of OSGi specifications and related runtime issues
  • Development of non-standard infrastructure deemed to be essential to the running and management of OSGi-based systems
  • Implementation of key framework services and extensions needed for running Eclipse (e.g., the Eclipse Adaptor, Extension registry) and deemed generally useful to people using OSGi.



Knopflerfish is another open source OSGI framework. Led and maintained by Makewave, Knopflerfish delivers significant value as the key container technology for many Java based projects and products.

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