MIT Open Courseware offers an extensive series of online courses in Chemistry. Course format generally includes lecture videos, interactive concept quizzes (solution key), problem sets, terms and definitions, suggested topics and links, and exams (with solution key).

Formerly known as ChemWiki

Open textbook from the Open Michigan project.

From the OpenStax collection.

From the International Union of Pure and Applied Chemistry, this interactive version of the Gold Book includes ring maps, popup structures, and link maps.

Three ebooks and online courses from Oregon State University.

This site was established to provide chemistry students with a library of spectroscopy problems. Interpretation of spectra is a technique that requires practice - this site provides 1H NMR and 13C NMR, DEPT, COSY and IR spectra of various compounds for students to interpret.

Allows students to easily access state-of-the-art computational chemistry software for free, created by SSU's Dr. Mark Perri. Includes tips on how instructors can incorporate computational chemistry into their undergraduate teaching and research curriculum without the hassle of compiling, installing, and maintaining software and hardware.

The Magnus program for chemical calculations is being developed by Jonathan Goodman and members of the Goodman Group.

Wide variety of simulations and education tools from SUNY Oneonta.

Tool from Oklahoma State University to help students learn about all aspects of the ideal gas law.

Online simulation of a chemistry lab designed to help students link chemical computations with authentic laboratory chemistry.

A collection of virtual labs, scenario-based learning activities, tutorials, and concept tests, from a group of faculty and staff at Carnegie Mellon University.

A project of the National Institutes of Health, PubChem collects information on chemical structures, identifiers, chemical and physical properties, biological activities, patents, health, safety, toxicity data, etc. PubChem provides several avenues for programmatic access to its data.