Download of hhkb-keymap-tool 1.3.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The program is categorized as System Tools. This free Mac application was originally created by PFU Limited.
From the developer:
Happy Hacking Keyboard Keymap Tool allows keymap customization on HYBRID Type-S and HYBRID models. By running this tool, you can also update firmware on HYBRID Type-S, HYBRID, and Classic models. However the keymap customization function is not available for Classic models.
You may want to check out more software for Mac, such as Missing Sync for Palm Pre, FourEyes3D or SplashMoney iPhone Desktop, which might be related to hhkb-keymap-tool.