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I think grep is your best option. Navigate to the src directory of your Catkin workspace to issue these commands.

List Python and C++ nodes:

grep -Er "rospy.init_node|ros::init"

List Python and C++ subscribers:

grep -Er "rospy.Subscriber|.subscribe\("

List Python and C++ publishers:

grep -Er "rospy.Publisher|.advertise<"

List Python and C++ services:

grep -Er "rospy.Service\(|.advertiseService\("

Note that this assumes in Python you always call things relative to rospy. For C++ you could also grep on ros::Subscriber, ros::Publisher, and ros::ServiceServicer, but I did it the way I did so you can account for when you have separate header and source files - the commands I provide pick up on where the actual definition is provided.