code: def list(self, args, unknown):
          
          pm = mayaplugins.MayaPluginManager.get()
          plugs = pm.get_all_plugins()
          if not plugs:
              print "No standalone addons found!"
              return
          print "Addons:"
          for p in plugs:
              if isinstance(p, coreplugins.JB_StandalonePlugin):
                  print "\t%s" % p.__class__.__name__
docs: List all addons that can be launched
  
          :param args: arguments from the launch parser
          :type args: Namespace
          :param unknown: list of unknown arguments
          :type unknown: list
          :returns: None
          :rtype: None
          :raises: None