General physics information including first openly published documents from the history of high energy lasers in the USSR, & a collection of papers and video materials devoted to 40th anniversary of "Scientific and Production Association ASTROPHYSICS".
ChemWiki is a Open Access supplementary textbook that is written and re-written by both students and faculty members and is directed by Prof. Delmar Larsen. A freely available account is required to edit the site modules.
Textbook Revolution provides access to free educational materials with links and reviews of textbooks and select educational resources, as PDF files, e-books, or web sites containing course or multimedia content.
"The DeskToppers are the quick and easy form of the Alexander Arrangement of Elements (AAE), especially useful in a full classroom, hands-on lesson just prior to the lesson in your curriculum that normally introduces the periodic table." (from website)