NAPS2 is free and open source scanning software for Windows, Mac and
Linux.

Easily scan with devices from Canon, Brother, HP, Epson, Fujitsu, and
more. Then save to PDF, TIFF, JPEG, or PNG with a single click.

Use the best drivers for your scanner.

Use SANE and ESCL drivers to connect to USB and network scanners. Also
choose settings like DPI, page size, and bit depth.

Scan from a flatbed or automatic document feeder (ADF), including
duplex support.