If you are looking for an image cropper user interface ready to use in your web projects and simple to customize, take a look at this list with the best and free image croppers UI currently in circulation.

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1. Yahoo! UI Library ImageCropper
Yahoo! UI ImageCropper control provides an API and skin for making an image croppable. Simple to use and customize in your web projects, this cropper is actually one of the best free cropper interface you can find. The ImageCropper comes with a default skin, but you can extend or override this as needed using CSS.

2. Kroppr
Kroppr is intended to help webmasters allow their users to manipulate the images available on the site. With this script you can rotate, resize, crop and save images to your hard drive. Kroppr is using the graphic tools found on a common hosting server so an expensive server is not required for this script to run. In the same time, if there are more choices on the server, Kroppr is choosing the one with the best results in quality and server load.

3. Jcrop
Jcrop is a quick and easy way to add image cropping functionality to your web application. It combines the ease-of-use of a typical jQuery plugin with a powerful cross-platform DHTML cropping engine that is faithful to familiar desktop graphics applications.

4. Javascript Image Cropper UI
The JavaScript image cropper UI is a very popular image cropper which allows the user to crop an image using an interface with the same features and styling as found in commercial image editing software, and is is based on the Prototype JavaScript framework and script.aculo.us.

5. MooCrop
MooCrop is an Image Cropping utility using the amazingly powerful mootools javascript framework. The script is completely customizable with CSS, detects and handles multiple CSS box models, allows for masking to be toggled and set minimium size limit and it's really fast.

6. UvumiTools Crop
UvumiTools Crop is an advanced image cropper which gives your users the ability to create a selection area that can be used to crop an image live on your web site. You can customize a lot of parameters such as minimum sizes, keep aspect ratio (or not), Real time preview and reuse it quickly on your web project.

7. PHP & JQuery Photo Upload and Crop
PHP & JQuery Photo Upload and Crop is another nice image cropper which use jQuery and PHP to upload, resize, crop and save images. It's simple to customize and reuse in your web projects. You can find full documentation about this script here.