An update of this previous post, you can get here the source (under GPL) and binary for the project Neurality.It's still under development, but you can still do some basic operations, such as: creating and learning Neural Networks, open image to get the recognized text (before and after the learning procedure).
Lots still needs to be done (scanner support, copy, drag and drop of image and recognized text, as well as image processing and manipulation tool). It's not hard to be done, the majority is implemented in the code but need to be updated in the GUI.
Another thing to be done, is to add Linux support (probably using KDE).
Hope you'll like it anyway.