Supersized is a fullscreen background slideshow built using the jQuery library. This jQuery plugin is highly customisable and easy to implement into you website.
Rhinoslider is a flexible jQuery slider plugin that can present any HTML element (text, images, videos, etc.). The plugin comes with lots of transition effects and new effects or styles can be added with ease .
It has options for every possible variable from the customization of the effects to auto-play, play direction, random display and navigation.
Camera slideshow is an open source project, based on Diapo slideshow, but improved a lot. You can download it and use for free.
Camera slideshow requires jQuery 1.4+ and other jQuery plugins are necessary if you want to use some functionalities: jQuery Easing and a customized version of jQuery Mobile to use Camera with mobile devices.