The site of the American Chemical Society, a congressionally chartered independent membership organization representing professionals at all degree levels and in all fields of chemistry and sciences that involve chemistry.
The course consists of "intensive practical training in basic chemistry lab techniques" and the site includes a host of instructional videos. Students of chemistry and educators will find this site most useful.
A blog written by a group of scientiests, mathematicians, adn engineers dedicated to writing and releasing free and Open Source scientific software to help anyone who is inspired discover something new about the natural world.