GOAT (Graphical OSGi Analysis Tools) is one of the Apache Aries samples. It's not released code but can be found in SVN and is easily built. Check building Aries to see how.
When you have built the project, navigate to the samples/goat/goat-assembly/target directory and run the sample by typing:
java -jar osgi-3.5.0.v20090520.jar -console
Have a look at the bundles (using 'ss'), you should see several 'goat' bundles active. Now, so that you can look at it later, install the Aries JDBC blog sample into the same framework. You should be able to do this just by copying the samples/blog/blog-jdbc-eba/target/*.eba into the goat-assembly/target/load directory.
Check that the blog sample is running by navigating to http://localhost:8080/org.apache.aries.samples.blog.web/, you should see this:
Now, in a different browser window, navigate to http://127.0.0.1:8080/org.apache.aries.samples.goat.web/web/. You should see this:
Not very exciting. Click on the drop-down beside 'DummyProvider' and select 'BundleContextModel', then click 'Use Provider'. Wait a few seconds while the screen builds itself, it should look like this:
On the left hand side you'll the same list of bundles as you saw with 'ss' from the command line, in the right hand area you can see each bundle drawn as an oblong shape. Since we are displaying all the bundles in the platform this is probably a bit too much information. Hit the 'Hide all' button at the top to get rid of them.
Use the slider to move down the list of bundles on the left until you get to the blog sample bundles. Click on 'show' for each blog sample bundle, grab the bundles and move them around to get to this:
Now you can see the four bundles that comprise the Blog sample and you can see a bit of information about how they are related to each other. Try clicking on the 'twisties' to expand information about packages and services.