Since you asked... There is a boat load of them (pun intended).

Conventional Lubricants:
Motorcraft Super Duty 15W-40 or 10W-30
Penzoil Long-Life 10W-30, 15W40
Shell Rotella-T 15W-40
Chevron Delo 400 15W-40, 10W-30
Mobil Delvac 1300 Super 15W-40
Valvoline/Cummins Premium Blue 15W-40
Union 76 Guardol QLT 15W-40
Union 76 T5X Heavy Duty 15W-40
Kendall Super-D 3 15W-40, 10W-30
Quaker State FCI HDX Plus 15W-40
Exxon XD-3 Extra 15W-40
Phillips 66 Super HD II 15W-40
Conoco HD Fleet Supreme 15W-40, 10W-30
Citgo Mystik Premium Fleet 15W-40
Citgo Mystik JT-8 15W-40, 15W-50, 10W-30
Castrol GTX Diesel 15W-40

Synthetics:
Amsoil 15W-40 Synthetic Blend Oil
Chevron Delo 400 Synthetic 0W-30 or 5W-40
Mobil 1 Turbo Diesel Truck Oil 5W-40 Synthetic
Mobil Delvac 1 ESP 5W-40 Synthetic
Motorcraft Super Duty 5W-40 Synthetic
Valvoline Premium Blue Extreme 5W-40 Synthetic
Shell Rotella T 5W-40
Schaeffer's Supreme 7000 Synthetic Blend 15W-40
Schaeffer's Supreme 9000 Synthetic 5W-40
Kendall SHP Diesel (synthetic blend) 15W-40
Petro-Canada Duron XL 15W-40 Synthetic Blend
Royal Purple Synthetic 15W-40
Citgo Mystik SX-8 15W-40 Synthetic Blend
Advantage Duragard Super HD 15W-40
Ford is recommending to use the following oils for the listed operating temperature:
SAE 15W-40 is the preferred oil above 30 degrees, but it is acceptable for use down to 10 degrees, and is recommended for towing down to this temperature.
SAE 10W-30 is the preferred weight between -10 to 30 degrees.
SAE 5W-30 and 5W-40 is acceptable for use below 30 degrees, and 0W-30 is acceptable below zero.
(All temperatures are in Fahrenheit)

Most (not all) of the above info is from BITOG which is an excellent source of oil info
FWIW Many 6.0 owners run 5W-40 synthetic year round with great results-