Sheffield ChemDex Chemistry resources on the InterNet, compiled by Mark Winter at the University of Sheffield, U.K. This is a comprehensive and exceptionally well-organized set of links, indexed by subject, institution, and country.
Chemical Education Digital Library - "ChemEd DL seeks to provide exemplary resources for chemistry teachers and students—resources that are versatile and reliable tools that span all aspects of chemical education, from middle school science through college-level classes and topics. Our collection includes interactive simulations, tutorials, activities, wikis, reference materials, images, video and even more."
About.com Chemistry - This commercial site contains a variety of useful material, including worked problems, simple experiments and demonstrations, and tutorial materials. It is very well organized, with topical Chemistry news features, lists such as "What's it made of", and subject-oriented links all available from the home page. The subject links are all nicely annotated. But watch out for the annoying won't-go-away pop-up ads advertising online casinos and such that start showing up as you get into some of the sections.
Teaching Resources in Chemistry An exceptionally comprehensive and well-annotated site organized by Knut Irgum of Umeå University, Sweden. This site contains lots of dead links and is apparently no longer being maintained.
Martindale's Virtual Chemistry Center - A very wide-ranging and well organized collection of resources, including spreadsheets, simulations and videos.
ODP Science:Chemisry:Education - the DMOZ Open Directory Project is a non-commercial directory to Web resources, organized in a logical, hierarchical way.
101science.com - Chemistry - A real hodge-podge, with many links to animation and videos, admixed with a lot of junk, such as one-page "handouts" with a few hand-written formulas scrawled on them.
Chemistry Web Resources - this site maintained by Ron Rinehart of Monterey Peninsula College contains a wealth of material, all well organized in a visually-attractive way.
Serendip Interactive Chemistry - The focus is not on course syllabi or notes but rather on materials from which individuals can learn themselves, and particularly on those with an interactive component, including many applets. This list and annotations was created by Katie DiFelice of Bryn Mawr College. Each link is rated as to level, playfulness, interactivity, and explanation.
The Alchemy virtual library An extensive collection of texts, graphic images and book references assembled by Adam McLean.
Analytical Sciences Digital Library - This NSF-sponsored site contains links to a variety of materials relating to analytical chemistry, including Web pages and lab manuals for individual courses.
Biography - Eric's Treasure Trove of Scientific Biography contains information on a wide variety of scientists. .
Chemistry Departments in U.S. four-year colleges - Maintained by Chuck Huber of UC-Santa Barbara.
{Ethics in Science} - Resource compiled by Brian Tissue of Virginia Tech U. (Link is to last archived update 4/2007.)
{History of Chemical Engineering and Chemical Technology} -(1997-2010) Part of a now-dead site (Exploring and Collecting History Online), a directory to 5,000+ websites concerning the history of science, technology, and industry.
(Mineralogy) - links to some of the best sites dealing with minerals and geological information. [≤ 9/2006]
News items - SciCentral - The Physics and Chemistry section links to recent news articles pertaining to these disciplines.
NIST WebBook Provides access to the full array of data compiled and distributed by NIST under the Standard Reference Data Program. Thermochemical data, IR and mass spectra, etc.
Exploring Materials Engineering - links to a variety of sites relating to materials and polymer science.
Science's Next Wave is "an electronic network for the next generation of scientists". with emphasis on career information.
Physical Properties and Thermodynamics link collection at U Illinois Chicago contains numerous links to compilations of physical properties (Henry's Law constants, solubilities, refractive indices), phase diagrams, and related data.