- Hydroponic Society of America - Non-profit organization dedicated to the exchange of information in the field of hydroponics. Members include educators, researchers, vendors, commercial growers and hobbyists.
- Hydroponics Resource for Inexpensive Startups - Secrets for starting hydroponic businesses. Includes information about hydroponic nutrients, maintenance, production, greenhouses, and marketing.
- Institute for Simplified Hydroponics - Dedicated to supporting efforts to use simplified hydroponics to reduce global hunger and poverty. Offers classes and activities to support the education of simplified hydroponics, especially in developing nations.
- History of Hydroponics - Gary V. Deutschmann covers the history and future of hydroponic gardening.
- Growing Hydroponic Tomatoes - Interactive web site from the University of Arizona provides practical, accurate information on growing hydroponic tomatoes for students, hobbyists, and beginning growers.
- The Growing Edge - A bimonthly magazine dedicated to hydroponics, aquaponics, and greenhouse growing. Provides a wealth of free information for soilless growers.
- How To Produce Green Fodder Hydroponically - Book on small scale cultivation of green fodder via the hydroponic method. Website in Spanish and English.
- Home Hydroponics - An excellent introduction to the hydroponic methodology from the Virginia Cooperative Extension.
- Hydroponic Gardening - Suite101.com - The Hydroponic Gardening page at Suite101.com, a community site. Offers articles, links and discussions pertaining to hydroponics.
- Hydroponics as a Hobby - A circular from the Extension at University of Illinois at Urbana-Champaign, offers a basic history and guide to hobby hydroponics.
- Crop Physiology Laboratory - Hydroponics - Excellent source of information for recirculating hydroponics methodology from Utah State University.
- Hydroponics Project - Photographic presentation of hydroponics project at Colorado State University.
- Hydroponic Lettuce Production - Details of setting up and running a lettuce production facility using Controlled Environment Agriculture techniques. Illustrated with descriptive photos. Cornell University.
- Production of CEA-grown Hydroponic Spinach - Publication by the Controlled Environment Agricultural (CEA) Program of the College of Agriculture and Life Sciences at Cornell University. An electronic handbook for the production of CEA hydroponic spinach.
- Role of Perlite in Hydroponic Culture - A research report issued by the Perlite Institute, Inc. by Dr. David A. Hall, Principal of the Pershore College of Horiculture in the United Kingdom
- Vitaran HC - Software for calculating nutrition formulations in hydroponic applications. Both site and software in Spanish and English.
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