Here are some of the web-based tools that I find most useful in my teaching practice:
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Padlet allows for the quick creation of custom web "walls" that allow students to post and share.
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Socrative is a great web-based assessment tool.
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SMART Exchange is a place for teachers to share and search for SMART Notebook-based lesson plans and ideas.
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GeoGebraTube is the place to explore all things GeoGebra.