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Explain evrything is a great screencasting app because it allows you to make narrated slideshows, import from Dropbox, PDF, PPT, Word, Etc. Also, you can Zoom in and out during the presentation, change the color and size of your pen, and more. You can rotate your file as well and change the orientation. You can also narrate a live web page as you annotate it. You can immediately upload to Youtube and dropbox as well.
It costs $2.99, but I think it’s well worth it.