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teacher can create a local network for classroom where students can use mobile phones to communicate with each other. teacher can moderate texts. 

Audioboo. Because sound is social. We are a mobile & web platform that effortlessly allows you to record and share audio for your friends, family or the rest of the world to hear.

Nice article about How Parents fit in to the technology we are bringing in to our classrooms.

list of many polling tools

Researchers from Columbia University, the University of Maryland, and the Smithsonian Institution beat me to this. They developed this free mobile app that uses visual recognition software to help identify tree species from photographs of their leaves. I use it to help students practice careful observation prior to writing. It motivates them to use specific nouns when describing a setting.

I've used the HelloSign Chrome extension to annotate and sign pdfs. Here is another tool that seems to do the same/similar thing. Am not sure how the two compare.