I've been rather confused. On the front page, it says Dues Ex has a Mac and Linux port, set when I go to the item page, it only says it's available for Windows.

So is it available for the Mac or not?

I just checked it in my library, and it only has a Windows installer available.

Well poop. And I got all excited for a second.

Thank you very much.

AFAIK it is not.

But you can make it running on OS X using Wineskin. Tried today - not that difficult.
If you need further information, contact me.

EDIT: You can also find a step-by-step explanation here!