Kropper: a free, open-source image cropper for Rails apps

. It was inspired by the image-cropping UI in Apple's iChat and is best suited for cropping of user profile images or other instances where you want cropped images to have a specific aspect ratio. This demo app manipulates images that are stored with the attachment_fu plugin, but it would be easy to modify it to crop images stored in some other fashion. Features It's easy to use, and it looks pretty sweet. Very little Ruby code to add to your app, especially if you're using attachment_fu to handle images. I...

http://kropper.captchr.com/

http://b.hatena.ne.jp/entry/http://kropper.captchr.com/