The Tuscany runtime can be run in and OSGi container. 

Running in Equinox
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On Windows, run
java -jar ..\..\modules\osgi-3.5.0-v20090520.jar -configuration ..\..\features\configuration -clean -console

On *Unix, run
java -jar ../../modules/osgi-3.5.0-v20090520.jar -configuration ../../features/configuration -clean -console

You should see the osgi console:

osgi>

osgi> Jun 22, 2009 1:32:27 PM org.apache.tuscany.sca.extensibility.equinox.EquinoxServiceDiscoveryActivator start
INFO: Equinox-based service discoverer is now configured.

You can run "ss" command under the osgi> to see the status of the bundles.
osgi> ss

Then you can install and start contributions as bundles by doing the following:

osgi> install file:./path/to/contribution_bundle.jar

Note that contribution_bundle.jar will need an activator in order to register the bundle as a SCA contribution
see samples/????
TODO is this still true

Running on Felix
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See http://tuscany.apache.org/documentation-2x/running-tuscany-sca-2x-with-equinox-and-felix.html