GScan2PDF is a cross platform that produces PDF from a scanned documents.
The GScan2PDF is a multi-platform, open source GUI application that eases the process of producing a multipage PDF from a scanned document. The GScan2PDF also produces DjVu's from the scanned document. It can also scan one or several pages in with File/Scan option and also create PDF of selected pages with File/Save option. The TIFF export is handled by libtiff for faster and smaller memory footprint for multipage files.