Inventaria is a project mainly written in JAVASCRIPT and PHP, it's free.
Web application for inventory control
Author Pedro L. Morales 2011
License Creative Common with Attribution and No Commercial marks.
Inventaria is a little project to manage the inventory of school's education departments.
It make use of advanced web technology, ajax, jquery, jquery-ui, mysql and web presentation with CSS.
I think that It is a good example of this kind of applications and It should be the basis of a bigger project.
Enjoy it!