From Griffin Technology:
The iMate driver provides the functionality of the ADB manager. This allows ADB devices that require custom drivers to operate on an iMac, iBook, PowerBook G3, PowerMac G4, or a Mac with a USB card. Some ADB devices such as keyboards, mice, and bar code readers can operate with the iMate without any driver software at all. You may only need to download the iMate driver for devices with custom drivers.
What's new in this version:
Corrects a bug that could cause some custom ADB drivers to not work correctly after waking from sleep. It also addresses a problem where the CD tray would sometimes eject on certain models during startup.