ScienceDirectory.info is a leading science website including agriculture, metrology, industrial engineering, earth sciences, geography, mathematic, aquaculture, aerospace and more.
Physics Animations
Animated experiments and visualizations on physics with theoretical explanations. There is also a physics forum, free samples and educational programs for download.
http://physics.nad.ru/
TOPS Science
TOPS Learning Systems, a nonprofit educational publisher, dedicated to making inexpensive, creative, hands-on science and math available everywhere.
http://www.topscience.org/