NIASH's Test Tool is a prototype driver for scanners based in NIASH chipsets (HP Scanjet 3300c, 3400c, 4300c, and Agfa Snapscan Touch). It supports scanning (at fixed DPI) and experimental calibration. It can also be integrated in SANE as a backend.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.