Find Desktop is integrated with a powerful "full-text" retrieval engine, supported by O.C.R. (optical character recognition) engine. This allows you to search directly in the text, starting from one word or exact phrase contained in electronic or image documents. Other important functions are the mail indexing system, the enhanced scanning functions (with virtual annotation capabilities) as well as the management of the classification fields associated with documents render Find Desktop the fast and economic solution for document management. Find Desktop is equipped of technology "Highlight" that evidences directly on the original document (image file or electronic file) the search results and supports the most common electronic document formats (Adobe Acrobat PDF, Microsoft Word, Microsoft Excel, etc..) with search capabilities also in ZIP file.
The software is expensive ($290) but it prevents you from the hassle of scanning images though I am not sure of the accuracy of the built-in OCR engine.
Maybe other established players can also extend their product with an OCR engine and release a pro or enterprise version of their free products. I know of one such company Abbyy which allows other developers to use Abbyy's award-winning OCR / ICR / OMR and barcode recognition technologies in their own products and solutions, ofcourse for a price.