The 2.1.0.3 version of iMountX for Mac was available as a free download on our website. The software is included in System Tools. This free software for Mac OS X was originally developed by Daniele Kraehenbuehl.
From the developer:
This application is a GUI for the Teminal command dutil
Scan for attached HD (usb or firewire)
Mount and unmount volumes
You may want to check out more software for Mac, such as CopyPath, Libra or TrimTheFat, which might be related to iMountX.