Fortified Wines are wines to which brandy has been added to increase the level of alcohol above 15%.
Bellow is a list of the most famous fortified wine by area, style,and producers.

Sherry – Styles: Fino, Amontillado, Oloroso, Pedro Ximenez (PX)
Producers / Wines
Osborne Jerez-Xérès-Sherry Fino Sherry
Sandeman Armada Rich Cream Oloroso Sherry
Gonzalez Byass Nectar Pedro Ximenez Dulce Sherry

Port – Styles: Ruby ( young port up to 4 years old), Tawny ( 5+ years old)
Producers / Wines
Presidential Porto Ruby
Ferreira Dona Antonia Reserva Port
Fonseca Tawny Port 10 Year Old
Ferreira Tawny Port
Taylor Fladgate 20 Year Old Tawny Port

Producers / Wines
Blandy's 15 Year Old Malmsey Madeira
CARM Casa Agricola Roboredo Madeira Reserva

Producers / Wines
Cantine Florio Marsala Dry
Cantine Florio Marsala Fine Sweet

France- Vin Doux Naturel
White Vin Doux Naturel
Muscat de Beaume-de-Venise, Southern Rhone Valley
Producers / Wines
Cave Balma Venitia Vignerons de Beaumes de Venise Muscat de Beaumes-de-Venise
J. Vidal-Fleury Muscat de Beaumes-de-Venise

Muscat de Rivesaltes, Rousillon
Producers / Wines
Chateau de Caladroy Muscat de Rivesaltes

Red Vin Doux Naturel
Banyuls, Rousillon
Producers / Wines
Gerard Bertrand Banyuls

Maury, Roussillon
Producers / Wines
Domaine des Schistes Maury Vin Doux Naturel

Rasteau, Southern Rhone Valley
Producers / Wines
Cave de Rasteau Vin Doux Naturel Rasteau Signature