This article breaks down the importance of diving into the deep web, provides resources included in the deep web, and analyzes various aspects of the deep web such as deep web sites' size, qualification, etc.
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The deep website, science.gov, would be beneficial in teaching science for older elementary students if you were to have them do some kind of research project. You could create a custom search engine and put this website in it to find information approved by the teacher.
"Gizoms" are hundreds of online simulations with lesson materials and supporting research-based strategies to build deep conceptual understanding in math and science. This can be used for all grades, and is awesome because it is very interactive and can simulate experiments you can't physically carry out in a classroom setting