• 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.
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• Belstein Dictionary - For users of the Beilstein Handbook of Organic.
• 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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• Martindales's Calculators On-Line Center - Physcis, Astorphysics & Astronomy.
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