RoboML  
   The Robotic Markup Language is an XML-based language for data representation and interchange in robotic applications.
   http://www.roboml.org/

CLAWAR  
   European Union Group developing specifications and requirements for Climbing and Walking robots.
   http://www.clawar.com/home.htm

JAUS  
   The Joint Architecture for Unmanned Systems (JAUS) is an initiative to develop an architecture for unmanned systems. It defines messages and component behaviors that are independent of technology, computer hardware, operator use, and vehicle platforms and
   http://www.jauswg.org/

Robotics Engineering Task Force  
   The RETF is an Intel research group attempting to formulate standards that specify reusable, interoperable building blocks for mobile robots. Their focus is on software framework and protocols.
   http://www.robo-etf.org/

SensorML  
   XML-based Sensor Model Language for describing the geometric, dynamic, and radiometric properties of dynamic in-situ and remote sensors.
   http://vast.nsstc.uah.edu/SensorML/

SML  
   The Spacecraft Markup Language (SML) provides a standardized representation of commands, telemetry, science data, and other information to be used in the development of space probes.
   http://xml.coverpages.org/spacecraftML.html

XRCL  
   The Extensible Robot Control Language (XRCL - pronounced zircle) is a relatively simple, modern language and environment designed to allow robotics researchers to share ideas by sharing code. [PDF]
   http://www.automationit.hut.fi/file.php?id=15