Comment 38 for bug 623438

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Yury V. Zaytsev (zyv) wrote : Re: Font size not correct in merged sandvich PDF

I am not aware of any open source OCR software that is doing multi-column document recognition. It's more of a segmentation task, rather than recognition itself, so it should be rather implemented in a front-end, such as OCRopus. If you have a linear text flow, sandwich PDFs can be read by a screen reader smart enough in a reasonable way.

Apart from already mentioned Finereader, old Cuneiform Windows freeware seems to be able to do multi-column.