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Abbyy FineReader
http://www.abbyy.com/finereader/
Abbyy FineReader has a suite of products for Mac and PC that are my personal favorite OCR technology. While it is a more expensive option, it is by far the most accurate solution that I've found to date.
Snapverter
https://chrome.google.com/webstore/detail/snapverter/plebojnaihkfjkkpgaemcjpnkmcpleih?hl=en-US
Snapverter works with Read&Write for Google Chrome. See the GCHS OCR page for further instructions. You will also need to install Read&Write. See the the Make Reading Easier > Listen page.
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