Here is a list of all documented files with brief descriptions:

common
jack
control.h	JACK control API
intclient.h
jack.h
jslist.h
metadata.h	JACK Metadata API
midiport.h
net.h
ringbuffer.h
session.h
statistics.h
systemdeps.h
thread.h
transport.h
types.h
uuid.h
weakjack.h
weakmacros.h