American Chemical Society, provides information about ACS publications, chemistry conferences, education in chemistry, news, careers in chemistry, and more.
ChemiCool gives basic information about the chemical elements and the periodic table, as well as an online chemical dictionary.
ChemSpider is a free service from the Royal Society of Chemistry, providing access to millions of chemical structures and integration to many other online services.
ChemWeb.com provides access to the information chemists need to enhance their research, product development, self-development, education, and/or their businesses in Chemistry and related disciplines.
The Internet Chemist: is an online tutorial that recommends key internet resources for education and research in chemistry, and offers advice on internet searching and website evaluation.
Learn Chemistry, from the Royal Society of Chemistry, provides resources to help you learn about the fundamentals and applications of chemistry.
Royal Society of Chemistry provides information about conferences, careers, publications, databases, and other chemistry resources.
SOLV-DB is a database (by the National Center for Manufacturing Sciences) of organic solvents giving physical properties and links to environmental and health & safety data.
Theoretical Chemistry: a Self-Guided Introduction for College Students, by Professor Jack Simons of the University of Utah.