XSane

XSane is a graphical scanning frontend. It uses the SANE-library to talk to scanners. XSane is designed for acquiring images with scanners (there are other devices like cameras and videodevices supported by SANE, but XSane is not designed for that purpose). You can scan to file, do a photocopy, create a fax, create and send a mail and start XSane from the GIMP as gimp plug in.

http://www.xsane.org

GNU License

If this app is not able to be portable then maybe some sort of similar scanner software please