Robot Operating System (ROS) is a collection of software frameworks for robot software development, providing operating system-like functionality on a heterogeneous computer cluster.
Robotis - Dynamixel MX-106T Servo (TTL). The Dynamixel MX Series servos feature a contactless (Magnetic) position encoder and PID control for superior accuracy and reliability. The MX series offers 12bit (4096) position resolution and can operate in the 360º range offering 0.008º resolution.