Any Adaptec SCSI adapter (or compatible) will work - the Adaptec 1540 or 1542 SCSI controllers are good choices. The software that Apple ships with the OneScanner for Windows is called Ofoto. These would be the best choices, as they've been tested with the scanner.
Note: Light Source (the developer of Ofoto) no longer offers support or software upgrades, and has no plans to revise Ofoto to be compatible with current versions of the Mac OS.