OK. Not really a full Photoshop CS4, but really for free. One of the strong reasons to get an upgrade to Photoshop CS4 is the Seam Carving resize feature (or content-aware scaling). It allows to resize an image while maintaining its important elements. For example, you can widen an image into a panorama, but the characters appearing in it will not be resized (just the background will extend between and around them).
But Photoshop CS4 is not the only one to do this: Seam Carving GUI is able to provide exactly this feature. For free!
You want to see it working?
Here is an image that I like, but what would it be if it was stretched into a square? But I don’t want to see the trees and the zebras stretched horizontally.
Original image that needs to go square
Seam Carving GUI does it for me:
After resizing
Download Seam Carving GUI for free, instead of buying Photoshop CS4.