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The MERLOT collection of Open Educational Resources includes thousands of free simulations on a broad range of topics. The database is searchable by keyword, and each item in the collection provides details including material type, authorship, brief description, peer review rating, and user rating.
ChemCollective (joint project from NSF, Carnegie Mellon, and NSDL)
Free, online chem lab simulations for topics including Stoichiometry, Thermochemistry, Equilibrium, Acid-Base Chemistry, Solubility, Oxidation/Reduction and Electrochemistry, Analytical Chemistry/Lab Techniques
Free online simulations and teaching activities for Physics, Chemistry, Math, Earth Science, and Biology (site has simulations for all grade levels; link takes you to simulations designed for university students)
Fee-based service that will work with faculty to create custom online and hands-on lab kits for your course
Fee-based service that will work with faculty to create custom online and hands-on lab kits for your course