• AGI GIS Dictionary - Free Edition - This on-line dictionary of GIS terms is brought to you by the Association for Geographic Information and the University Of Edinburgh Department of Geography.
• American Journal of Botany - Botanical Society of America.
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• arXiv.org - All papers Titles Authors Abstracts Full text Help pages Open access to 364,938 e-prints...
• Belstein Dictionary - For users of the Beilstein Handbook of Organic.
• Botany.com - Encyclopedia of Plants and Flowers.
• Dictionary of Botanical Epithets - The epithets are largely taken from alpine plants and found in the seed lists of the North American Rock Garden Society's seed list, alpine plant nursery catalogs and alpine references.
• Dictionary of Measures, Units and Conversions - This provides a summary of most of the units of measurement to be found in use around the world today, together with the appropriate conversion factors needed to change them into a 'standard' unit of the S I.
• Digital Library for Earth System Education - A free service funded by the National Science Foundation.
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• Encyclopedia Smithsonian - Features answers to frequently asked questions about the Smithsonian and links to Smithsonian resources on subjects from Art to Zoology.

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• How Many? - A Dictionary of Units of Measurement.
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• The Nine Planets Glossary
• NBII - National Biological Information Infrastructure a collaborative program to provide increased access to data and information on the nation's biological resources.
• MARTINDALE'S - THE REFERENCE DESK
• Martindales's Calculators On-Line Center - Physcis, Astorphysics & Astronomy.
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• UCMP Glossary - Phylogenetics, Geology, Biochemistry, Cell Biology, Ecology, Life History, Zoology, Botany, Paleogeography.
• WWWVL - History of Science, Technology and Medicine - Biographical Sources.

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