Quinta do Tedo - Porto Wines
- 18th Century, Single Quinta Porto winery producing vintage ports since 1995.
- http://www.quintadotedo.com/

Ouinta de Santa Eufémia
- The estate's history, and its LBV and tawny ports.
- http://www.casasantaeufemia.com/

Porto Solene
- Promoting their ruby and tawny reserves.
- http://www.portosolene.com/

Manoel D. Poças Júnior
- One of the few remaining estates still owned by a Portuguese family. Has information on the Porto Poças 2000 vintage.
- http://www.pocas.pt/

Niepoort
- Describes Niepoort's distinctive garrafeira, as well as other port types.
- http://www.niepoort-vinhos.com/

Martinez
- Featuring a map of the estates and lodges owned by Martinez-Cockburn's.
- http://www.martinez.pt/

Wiese and Krohn
- Includes a list of declarations of Krohn vintage port since 1957.
- http://www.krohn.pt/

Delaforce
- Information about the Delaforces, an old family of Huguenot origin, their company and their ports.
- http://www.delaforce.com/

Cockburn's Port of Portugal
- Describing the recent innovations in the port production process.
- http://www.cockburns-usa.com/

Churchill's
- Tasting comments on the vintage port, the LBV, crusted, tawny, and white ports.
- http://www.churchills-port.com/

Montez Champalimaud
- History, the four brands, the grapes and export markets of Quinta do Côtto.
- http://www.quinta-do-cotto.pt/

Bem Vindo ao C. da Silva
- The history and cellars of the C. Da Silva Port Company.
- http://www.cdasilva.pt/

Burmester
- Port wine producer located near Pinhão. Includes a history of this company which has been shipping port wine since the 18th century, and description of the vineyard and products.
- http://www.burmesterporto.com/

Borges Wines
- Pictures and descriptions of the available vintages of reds, whites, rosés, sparklings and ports.
- http://www.borgeswines.com/

Sociedade Agrícola e Comercial dos Vinhos Messias
- Describes, with some technical information, the products including the Messias port.
- http://www.cavesmessias.pt/

J. H. Andresen
- Animated guide to the products and cellars of the port house founded by Jann Hinrich Andresen.
- http://www.jhandresen.com/

Quinta de Ventozelo
- Produces Douro and Port wines. Includes product details, reviews, an award list, a photo gallery, and a vineyard map.
- http://www.quintadeventozelo.com/

Bacalhoa
- Produces red, white, sparkling, and fortified wines. Includes product descriptions and directions to the winery. Additional information is available in Portuguese.
- http://www.bacalhoa.com/

Sogrape
- Produces table and fortified wines, under numerous brand names, including Mateus, Offley, and Sandeman. Includes a company profile, along with information about the vinyards and brands. [Flash required]
- http://www.sogrape.pt/

Cavipor
- Produces still, sparkling, and fortified wines from the major regions under several brand names. Includes a portfolio, a company profile, and news. [Flash required.]
- http://www.cavipor.pt/

Porto Barros
- Founded in 1913, this producer specializes in old tawnies, also producing Douro table wines and brandy. Includes product descriptions, a company history, and vineyard information.
- http://www.porto-barros.pt/

Vallegre
- Wines from Quinta da Vista Alegre's vineyards of the Douro Valley.
- http://www.vallegre.pt/

Smith Woodhouse Port
- Founded in 1784, Smith Woodhouse has consistently been judged as one of the finest of all Vintage Port producers.
- http://www.smithwoodhouse.com/

Real Companhia Velha
- One of the leading producers of Port and the largest owner of the premium land in the Douro Valley.
- http://www.realcompanhiavelha.pt/

Dão Sul - Sociedade Vitivinicola, S.A.
- One of the new wine producers that have been revitalising the Dão region. Specializes in Quinta.
- http://www.daosul.com/

Calem
- Founded more than 140 years ago, the House of Calem owns grape vineyards and ageing cellars, and produces a wide range of Ports for a number of markets.
- http://www.calem.pt/

Croft Port
- Port house founded in 1678. Presents its history, products, vineyards, how port is made, the types of port, and a glossary. [Flash required]
- http://www.croftport.com/

Adriano Ramos Pinto, S.A.
- Produces Ports, dry reds, and brandy. Contains descriptions of the products, the vineyards, their museums, and the company. [Flash Required]
- http://www.ramospinto.pt/

G Porto
- Gilbert's line aimed at young adults. Includes product descriptions, cocktail recipes, and an award list. [Flash Required]
- http://www.gporto.com/

CARM - Casa Agrícola Roboredo Madeira, Lda.
- Produces a range of wines from organic grapes in the Douro region. Includes product information and a company overview. Also produces estate olive oils. [Flash required]
- http://www.carm.pt/

Quinta de Lemos
- Producer in the Dão region, whose first harvest was in 2000. Includes descriptions of grape varieties, a regional history, and a view of the vineyards. [Flash required]
- http://www.quintadelemos.com/

Casa da Ínsua
- Dão producer of reds and a white. Includes descriptions and pictures of the manor and its gardens. Also contains product information and a property history. [Flash required]
- http://www.casadainsua.pt/

Kopke Ports
- Port producer and exporter. Includes a company history and product descriptions.
- http://www.kopkeports.com/

Quinta de Roriz
- Makers of Port and Douro table wines. Contains information about products, vineyards, history, and distributors.
- http://www.quintaderoriz.com/

Rozès Porto
- Includes a profile of this Port producer, along with descriptions of wines, a list of distributors, and a few recipes.
- http://www.rozes.pt/

Symington Port and Madeira Shippers
- Owns Warre, Dow, Graham, Smith Woodhouse, Gould Campbell, Quinta do Vesuvio and the Madeira Wine Company.
- http://www.symington.com/

Quinta de la Rosa
- Small family-owned vineyard producing Ports, wines and olive oils. Also offers accommodations on the estate
- http://www.quintadelarosa.com/

José Maria da Fonseca
- One of the oldest producers of Portuguese table wines and Setubal dessert wines. Markets under several other brand names, including Lancer's.
- http://www.jmf.pt/

Quinta do Portal
- A family-run winemaking company based in the Douro Valley in northern Portugal. Information on its white and red wines as well as a range of Ports.
- http://www.quintadoportal.com/

Quinta do Noval
- Douro based, renowned producer of vintage Port, particularly its Nacional. Site offers information on the vineyards, the winemaking technique and the wines.
- http://www.quintadonoval.com/

Cortes de Cima
- Located in the Alentejo region in southeast Portugal. Harvest report and ordering information.
- http://www.cortesdecima.pt/

Taylor, Fladgate and Yeatman
- One of the oldest and most famous Port houses. Site also available in French and Portuguese.
- http://www.taylor.pt/

Fonseca Guimaraens
- One of the most famous Port houses. Site is also available in French and Portuguese.
- http://www.fonseca.pt/

The House of Sandeman
- Specializing in Port and Sherry for more than two hundred years.
- http://www.sandeman.com/

Graham's Port
- Universally acknowledged to be a leader in the field of Vintage Port.
- http://www.grahams-port.com/

Dow's Port
- Founded in 1798, and 100% family-owned. One of the great names in Port.
- http://www.dows-port.com/