JMSReceiver and DBReceiver require proprietary driver jars added to the Chainsaw classpath, which we obviously can't ship.
There are also additional Commons VFS filestore implementaitons which may be useful but which we don't include. For more information on Commons VFS, see http://commons.apache.org/proper/commons-vfs/download.html
Place any required jars in your .chainsaw/plugins directory (the .chainsaw directory is in your home directory)
Start Chainsaw, which should now recognize the existence of these components and allow you to use them.
This applies to all distributions.