I also do not know how many there are, or in which boards they currently hide...
where is the 2nd?there is "OS" > "Embedded".This has 2 refined "Embedded" boards.All of them are for microcontrollers, or other form of hardware that would fall under this name.Old threads ended, up outside them, because until an hour ago they did not exist at all.Putting them under OS seemed to be closest match under existing board names.They are not currently that frequented that they call for a new top level board.That said, how would you have named/structured them?