The Cambridge Crystallographic Data Centre (CCDC) provides many free programs that can be used to view and manipulate crystal structures. Additionally, they have made a subset of the Cambridge Structural Database (CSD) available for teaching purposes and many educational activities have been created to go along with this teaching subset (see link below). This teaching subset can be freely viewed through the WebCSD interface or can be used in the freely-available Mercury program. (Mercury is avaliable for Mac, Windows, and Linux systems.)

Towards the end of the semester, when we were starting to read more of the primary literature, I realized that the Miller Indices were present in most of the papers that I wanted to discuss. However, I couldn't find any good resources in textbooks that would help to explain what these were. I found this online resource through the University of Cambridge that is engaging, interactive and concise.

The Materials Project is part of the Materials Genome Initiative that uses high-througput computing to uncover the properties of inorganic materials.

It's possible to search for materials and their properties

It employs high-throughput computation approaches and IT to create a system that can be used to predict properties and construct phase diagrams andPourbaix diagrams.

Hilary first higlighted this resource as a news item before we had a web resource category. I'd like to bring it back to people's attention as a web resource because of its value. 

The resources on this website will help students learn concepts in materials chemistry, solid state chemistry, and nanoscience. The website provides links to

Frustrated by the lack of inorganic textbooks that really fit my materials-oriented first-semester inorganic course, I embarked on a project with my students to create a free online textbook. The students did most of the heavy lifting, and I'm pleased to report that the next class to use the book rather liked it. It is still a work in progress, but I would like to encourage everyone to check it out and edit it if the spirit moves you.

This website was put together by David W. Mogk, Montana State University–professor of geology and contra/square dance caller. Using square dancing, he shows symmetry elements present in space groups. There are videos on the website, but everything seems simple enough to do in class.