JBoss FUSE ESB vs. Apache ServiceMix vs. Apache Karaf vs. Apache Felix

What is JBoss FUSE ESB? And what is its relation to OSGI, Apache Felix, Eclipse Equinox, Apache Karaf and Apache ServiceMix?

• Felix and Equinox are both OSGI core runtimes
• Karaf is the ServiceMix Kernel and provides a "distribution" based on Felix or Equinox by adding features such as an admin console and blueprint configuration.
• ServiceMix is an integration container aka ESB powered by OSGI unifying the features of ActiveMQ, Camel, CXF, and Karaf (and other)
• JBoss Fuse ESB is an ESB based on ServiceMix adding bug fixes and extended documentation

Sources:

• http://felix.apache.org/
• http://www.eclipse.org/equinox/
• http://karaf.apache.org/
• http://servicemix.apache.org/
• http://www.redhat.com/products/jbossenterprisemiddleware/fuse/
• http://gnodet.blogspot.ch/2009/04/apache-karaf.html