* LiteOS: A Unix-like Operating System 
** http://lanterns.eecs.utk.edu/software/liteos/
** https://code.google.com/archive/p/liteos/

* Contiki
** http://www.contiki-os.org/
** https://github.com/contiki-os/contiki
** Wikipedia
*** https://en.wikipedia.org/wiki/Contiki
*** https://ja.wikipedia.org/wiki/Contiki