This is the Rumanian OOB. The others are going to take longer.

Unfortunately I don't know the Romanian words for "Army", "Group" and "Corps", so I've used the English terms.
Craiova province
I Corps:
Divizia 2 Infanterie - infantry model 2
Divizia 11 Infanterie - reserves model 1
Brigada 1 Cavalerie - cavalry model 2, 50 strength
1st Army (General Culcer):
Divizia 1 Infanterie - infantry model 1
Divizia 20 Infanterie - infantry model 1
Divizia 12 Infanterie - reserves model 1
Pitesti Province
Alt Lotru Group:
Divizia 23 Infanterie - infantry model 1
Divizia 13 Infanterie - reserves model 1
Divizia 1 Cavalerie - cavalry model 2
Ploesti Province
2nd Army (General Crainiceanu):
Divizia 21 Infanterie - infantry model 1
Divizia 26 Infanterie - infantry model 1
II Corps:
Divizia 3 Infanterie - infantry model 2
Divizia 4 Infanterie - infantry model 2
Brigada 2 Cavalerie - cavalry model 2, 50 strength
Braila Province:
III Corps:
Divizia 5 Infanterie - infantry model 2
Divizia 6 Infanterie - infantry model 2
Brigada 3 Cavalerie - cavalry model 2, 50 strength
Iasi Province
IV Corps (General Prezan):
Divizia 7 Infanterie - infantry model 2
Divizia 8 Infanterie - infantry model 2
Divizia 2 Cavalerie - cavalry model 2
Bucharest Province
3rd Army (General Aslan):
HQ
Divizia 10 Infanterie - infantry model 2 with Artillery brigade
Divizia 15 Infanterie - reserves model 1
Brigada 4 Cavalerie - cavalry model 2, 50 strength
VI Corps:
Divizia 16 Infanterie - infantry model 1
Divizia 18 Infanterie - reserves model 1
Brigada 5 Cavalerie - cavalry model 2, 50 strength
Constanta Province
VII Corps:
Divizia 9 Infanterie - infantry model 2
Divizia 17 Infanterie - reserves model 1
Divizia 19 Infanterie - reserves model 1
Tulcea Province
RUSSIAN XLVII Armeyskiy Korpus on loan as an expeditionary force
(General Saharov):
61. Pekhotnaya Diviziya - reserves model 2
Serbian Volunteer Division - infantry model 2 (Can someone translate that into Russian for us?)
3. Kavaleriyskaya Diviziya - cavalry model 3
Bucharest province should have two levels of fortification, and Iasi province one.
The Romanians only had 15 serviceable aircraft in August 1916 - not enough for a unit.