I have been doing work on this RTOS for over a year now, I think it is time for it to be listed in the OsDev Wiki:
JaeOS -- Just Another Embedded OS
A 'commodity OS' for small embedded systems.
People often choose to hack something ad hoc on bare metal
when they would benefit from having an OS core.
JaeOS is intended to be suitable for small projects that don't
need all the features in a bigger / commertial RTOS but still would benefit
from having an OS.
JaeOS is available for free under the MIT license.
Official website:
http://jaeos.com/