Levapan
- Specializes in yeast extracts and canned preserves. Company history, products and distribution details.
- http://www.levapan.com/

Wyeast Laboratories, Inc.
- Produces yeast for beer and wine making. Products, FAQ, company history and information about yeast.
- http://www.wyeastlab.com/

White Labs
- Manufactures liquid yeast for brewers. Includes recipes, yeast database, newsletter, homebrewer information and links, FAQ, and testimonials.
- http://www.whitelabs.com/

Turbo Yeast
- Offers extremely alcohol-tolerant yeast and complex nutrients that quickly ferment mash into alcohol.
- http://www.distillery-yeast.com/

Springer
- Offers a wide range of yeast products for food flavouring, fermentation, health foods, and wine making.
- http://www.springer.fr/uk/index.php?langue=uk

Lallemand
- Canadian based producer of yeast and bacteria serving international baking, wine, brewing, food, agriculture, human nutrition and pharmaceutical industries.
- http://www.lallemand.com/

Lesaffre Yeast
- Producers of yeast, yeast extracts, malt and a variety of bioconversions for the food and animal feed industry.
- http://www.lesaffre.com/default_eng.asp

Crown Yeast Company Ltd.
- Manufacturers of instant and active dried baking yeast for the bakery trade; exported worldwide.
- http://www.crownyeast.co.uk/