Change modifier keys (Option, Alt, Ctrl, etc.) on Mac OS X according to specific applications

Question

I'd like my Option and Alt keys to switch places in certain applications. Is there any way to change the modifier keys according specific applications in Mac OS X?

Alternatively; is there "an application for that"?

Solution

I use Ukulele for a PC keymap (there are included Logitech keymaps for OSX86 users). DoubleCommand is a great app to swap Command, Option and Control, and it can correct the behavior of the Home/End keys on PC.

Comments

[Arjan]

Option and Alt are the same key. Is this just a mistake, or do you really somehow simultaneously want both the OS X Option and the Windows/Linux Alt to sit on different keys?

[o0'.]

I guess it's a typo and he meant "option", "command" and/or "control". Still, you have a point.

[HikeMike]

You can remap individual menu items of a specific application in System Preferences » Keyboard » Keyboard Shortcuts » Applications. Especially if you want to switch Option and Control, this might be a viable choice.

[brevno]

You can't swap the modifier keys in a .keylayout (or with Ukelele). You could switch the keymaps under ⌥ and ⇧ for example, but that would only affect text output, not shortcuts in most cases. (⌘ and ⌃ don't usually even have output.)