The 2.0.2 version of One Key for Mac is available as a free download on our software library. Our antivirus analysis shows that this Mac download is clean. The current installer available for download requires 851 KB of hard disk space. One Key for Mac lies within System Tools, more precisely Automation. The actual developer of this software for Mac is Everyday Software.
From the developer:
One Key is a simple, integrated and elegant solution for using the function keys on your keyboard to launch applications or files with a simple key press. One Key is integrated into the system as an OS X preference pane to stay out of your way. No fancy setup is required to get it working, unlike other hotkey apps, One Key is one step simple.
You may want to check out more Mac applications, such as Rohos Logon Key, Key Holder or inTone Keys Pro, which might be related to One Key.