From OpenDriversWiki

Scanners

• SANE

Scanner Access Now Easy is the de-facto scanner driver software for UNIX

• Epson Avasys

Epson provide official driver for some of their scanners, some being open source, based on SANE, that eventually were incorporated into SANE.

• Lexmark Linux Developers Kit

Lexmark provides a Linux developer kit for their scanners (from all-in-one devices). Some parts are provided as binary object code.