There was a time when many of the photos in the IBM enterprise directory were often sized incorrectly and squeezed into an inappropriate aspect ratio.
Most of the people in the 400,000 person company didn't have access to or skills required for photo editing software. To help users crop their photos properly I created a tool that does few things, but does them well.
The user uploads photo and is presented with a cropping tool that is constrained to directory placeholder's aspect ratio, while also providing a real time preview.
The tool was implemented as a Java applet on the front end. The front end passed along the cropped image to the directory's back end for storage.