Interfacing Dynamixel actuators to ROS
One of the latest smart actuators available on the market is Dynamixel, which is manufactured by a company called Robotis. The Dynamixel servos are available in various versions and shown in the following image are some of the different versions of Dynamixel servos:
These smart actuators have complete support in ROS and clear documentation is also available for them.
The official ROS wiki page of Dynamixel is http://wiki.ros.org/dynamixel_controllers/Tutorials.