Similar to how most modern network printers support "driverless" printing, using the universal vendor-neutral printing protocol, many modern network scanners and MFPs support "driverless" scanning.
This backend implements both protocols, choosing automatically between them. It was successfully tested with many devices from Brother, Canon, Dell, Kyocera, Lexmark, Epson, HP, OKI, Panasonic, Pantum, Ricoh, Samsung and Xerox both in WSD and eSCL modes.
For eSCL devices, Apple maintains a comprehensive list of compatible devices, but please note, this list contains not only scanners and MFP, but pure printers as well.
This backend doesn't require to install and doesn't conflict with vendor-provided proprietary software like ScanGear from Canon, HPLIP from HP and so on.
Any eSCL and WSD capable scanner expected to work. Here is a list of devices that were actually tested. If you have success with a scanner not included into this list, please let me know.