Simple URDF visualizer for a three DOF robot arm.
Add to a ROS workspace.
Source.
source devel/setup.sh
Launch visualize.launch.
roslaunch visualize.launch
rosrun rviz rviz
Inside RVIZ do Add->RobotModel and Add->TF.
http://wiki.ros.org/urdf/Tutorials/Using%20urdf%20with%20robot_state_publisher