Wordpress-Simple-Carousel is a project mainly written in JAVASCRIPT and PHP, it's free.
Implements a simple, shortcode based image carousel.
A simple carousel implemented using a modified jQuery carousel library. Supports as many images as you wish: all images are expected to be the same size. Was initially setup to provide a carousel for mobile app screenshots.
Like this:
[simple_carousel id="screenshots" container="screenshots" img="/static/image1.png|/static/image2.png|/static/image3.png|/static/image4.png|/static/image5.png" width="275" height="532" class="alignleft" item="screenshots"]