An interesting overview of not only apps (free) but also some ideas on what to do with them:

http://teacherbootcamp.edublogs.org/2012/03/07/20-fun-free-apps-that-promote-student-centered-learning-literacy/

And this one:

http://sjunkins.posterous.com/103428526#more

And an interesting blog on free technology for teachers:

http://www.freetech4teachers.com/

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