IES Resources
EarthComm Resources
AGI Curriculum Materials
U.S. Department of Energy

AAPT-the American Association of Physics Teachers
AIP-the American Institute of Physics
APS-the American Physical Society
Center For Science Education
Lamont-Doherty Earth Observatory
NSF-the National Science Foundation
NIST-the National Institute of Standards and Technology
(formerly the National Bureau of Standards)

PERG at Kansas State University - Developers of Physics InfoMall
RPEG at Univerity of Nebraska - Lincoln - Developers of Physics InfoMall
The Developers of CPU
CPU Demo