Anders Gavare's _(YCX2 

| http://www.mdstud.chalmers.se/~md1gavan/ycx2/)
is a *(microkernel) implemented fully from scratch. Anders' goal is to educate himself on how to write such a thing. YCX2 is in a way a successor to _(Yoctix

| http://www.mdstud.chalmers.se/~md1gavan/yoctix/)
 (a monolithic kernel).