gomde(dog)mail.ru. It is free.
Thanks for your reply and interest to project.
In fact OCR is complex program and need some hardware. We use MacPro and it also sometimes has some limitation.
In practical way more useful send us some tibetan material for OCR.http://www.buddism.ru///ocrlib/Image2TIFF.zip
this is small and useful program for PC. It make TIFF black/white files from grayscale page scan.
It used adaptive binarisation algorithm and also page screw detector. It can convert book in batch.
So you can convert scanned on 400dpi grayscale pages and send as ZIP.
You can see some OCR example