Free Technology for Teachers, it has just worked out that I have a backlog of good science resources to share. Chem Collective is another good science resource.
Chem Collective is a project designed and maintained by Carnegie Mellon University's chemistry department and the National Science Digital Library. On Chem Collective you will find virtual labs for chemistry experiments, simulations, visualizations, tutorials, and auto-graded problems. Students and teachers can search the site by resource type or by chemistry topic.
Applications for Education
Chem Collective offers teachers the option to create their own Chem Collective pages containing resources and activities that they have selected from the Chem Collective library for their students.
Chem Collective offers free software that you can install on Windows and Mac computers to run virtual lab experiments with or without Internet access.