prototype es un framework AJAX e JAVASCRIPT que disponibiliza cientos de funciones para programar en AJAX y JS. Uno de los proyectos relacionados a prototype es el famoso script.aculo.us, junto a:
* Ruby on Rails, featuring integrated Prototype support
* script.aculo.us, Thomas Fuchs’ incredible effects and controls library built on Prototype
* Rico, rich Ajax components and effects built on Prototype
* Behaviour, a cool mechanism for cleaning up your HTML