Discus – a collection of library resources purchased by the South Carolina State Library for use by South Carolina citizens. If you don't live in SC, your state may purchase similar resources for its residents. The website includes an FAQ page with information about accessing the databases provided by DISCUS. It also has a neat "Kids" page that my students have used.
Kuder – “provides Internet-based tools and resources that help students and adults achieve their educational and career planning goals.”
Filamentality “is a fill-in-the-blank tool that guides you through picking a topic, searching the Internet, gathering good Internet links, and turning them into online learning activities. In the end, you'll create a web-based activity you can share with others even if you don't know anything about HTML or serving web pages.”
Make Worksheets – free sample worksheets available.
The Center for Innovation in Engineering and Science Education “sponsors and designs interdisciplinary projects that teachers throughout the world can use to enhance their curriculum through compelling use of the Internet. We focus on projects that utilize real time data available from the Internet, and collaborative projects that utilize the Internet's potential to reach peers and experts around the world. Below is a catalog of projects that are currently being or have been sponsored by CIESE . Each project has a brief description and links to the National Science Standards and NCTM math standards it supports.”
photo credit: Tools by mrjt