On 2/12/12, Mark Lively <[log in to unmask]> wrote, re: dropping two files
from different folders on an AppleScript droplet:
>
> You might want to download Apples developer tools(XCode)  If you sign up as a
>free developer you can download it for free from Developer.Apple.Com.  Inside
>of the folder Developer/Applications/Utilities there is a nice little program
>called FileMerge which displays things side by side in a nice manner.

Version 4.2.1 is also free via the Mac Apple Store, for use with Lion.