Grape Varieties
Information includes wine styles, characteristic flavors, and vinification methods.

Vitis International Variety Catalogue
Searchable database with very technical information and some pictures.

Pinotage Club
Cyber club for fans of the Pinotage grape of South Africa. Includes information about the grape, a newsletter, links, and membership details.

The Zin Zealot
Focuses on Sonoma County Zinfandel. Includes links to information about the grape, tasting notes, and a list of wineries.

Zinfandel Advocates and Producers
Non-profit organization dedicated to promoting Zinfandel. Contains information about the grape, membership details, and a list of events.

Enjoying Viognier
Features news and information about Viognier, a wine of the month, and a searchable database of retailers and prices.

GrapeSeek
Searchable collection of links, including grape variety and viticulture resources.

Wine and Juice Grape Varieties
Information about varieties suited for cool climates.

ZOW - Zinfandel on the Web
Contains tasting notes and links to Zinfandel-producing wineries.

Pinotage Association
Association promoting South Africa's Pinotage. Contains a history of the grape, winemaking information, and a producer list.

Anthony Hawkins' Wine Reference Material
Searchable glossary provides information about hundreds of types of grapes. Also contains vintage charts and tasting note terminology.

De Long's Wine Grape Varietal Table
Offers information about 144 varieties organized in an interactive table. Also sells a print version of the table.

P.S. I Love You
Industry organization dedicated to promoting the Petite Sirah grape. Includes a history of Petite Sirah, articles, a list of members, and recipes of suggested food pairings.