an OCR (Optical Character Recognition) program. It converts scanned images of text back to text files. GOCR can be used with different front-ends, which makes it very easy to port to different OSes and architectures.
The DjVuLibre XML Tools provide for editing the metadata, hyperlinks and hidden text associated with DjVu files. Unlike djvused(1) the DjVuLibre XML Tools rely on the XML technology and can take advantage of XML editors and verifiers.