“Keyboard & Mouse” control panel under System Preference in Mac OS X 10.4.x .
Xah Lee, 2007-12, 2010-09-01
This page gives some tips on how to swap the Command key with Option key on Mac OS X. (or switching any modifier keys)
“Keyboard & Mouse” control panel under System Preference in Mac OS X 10.4.x .
Starting with Mac OS X version 10.4, you can switch modifier keys to any other. This is done in “System Preferences‣Keyboard & Mouse”.
If you are using older version of OS X, you might look at the following software:
For Windows, you can use AutoHotkey, but requires some coding. See: AutoHotkey Basics.
Or, use my software: How to Swap Caps Lock, Alt, Control Keys On Windows.
For Linux users, GNOME and KDE both provides GUI for switching to the Dvorak Layout and swapping modifier keys. If all fails, you can resort to the xmodmap utility (see “man xmodmap”). Here's a xmodmap file for dvorak dvorakKeymap.txt.