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SANE - Scanner Access Now Easy

SANE consists of backends and frontends.

A backend is a driver for a (supported) scanner and camara devices that implements the SANE interface.

A frontend is an application that uses the the backend to access the supported scanners and cameras.

Frontends for SANE

There is xscanimage but apparently, XSane has more features and is easier to use.

This link has more frontends.