The OSGi specification currently supported by Knopflerfish is R3 and includes
the the R3 components listed below.

• Base framework The framework allows installing, start, stop,
  update and uninstalling of program or data components called
  bundles. Bundles are standard jar files
  
  
  
  The framework contains the following internal components:
  
  
  
  • PackageAdmin service. The PackageAdmin service allows
    bundles to inspect other bundles packages.
    
    
  • PermissionAdmin service. The PermissionAdmin service allows
    bundles to manage the permissions of other bundles.
    
    
  • StartLevel service. (new in R3)
    The StartLevel service allows grouping of bundles into startlevels.
    
    
  • URL service. (new in R3)
    The URL service allows bundles to safely add URL schemas to
    the framework.
    
    
  
  
  
• ServiceTracker utility The ServiceTracker provides utilities
  for handling dynamic services.
  
  
• Log service The log service provides logging functions for
  other bundles.
  
  
• HTTP service The HTTP service provides a web server where
  applications can publish servlets or data.
  
  
• Configuration Manager The Configuration Manager
  manages persistent storage of application data.
  
  
• Device Manager The Device Manager manages software
  components related to physical device drivers.
  
  
• UserAdmin service The UserAdmin service provides functionality
  for users, groups and access control.
  
  
• Preferences service (new in R3)
  The Preferences service provides API and
  functionality for storing bundle preferences.
  
  
• Position API (new in R3)
  The Position API allows applications to
  handle position-related data in a uniform way.
  
  
• Measurement API (new in R3)
  The Measurement API allows applications to
  handle measurements in well-defined units.
  
  
• Metatype API
  The Metatype API allows applications to publish typing information
  for configuration data.
  
  
• XML utility
  The XML utility class provides a template class for publishing
  XML parsers.