navX-MXP navX-Micro VMX-pi
Navigation Sensor + RoboRIO I/O Expansion
Navigation Sensor Robot Controller/Co-processor
FIRST FRC FIRST FTC & FRC, WorldSkills, Linux, Arduino, Windows Raspberry Pi, FIRST FRC
Classic.  Must-have.  Featured on FRC Championship Robots. Reduced size and cost. Great as a second IMU. Develop intelligent and autonomous robots, or use as a FRC motion/vision co-processor.