Kopjax is a project mainly written in ..., it's free.
Simplistic Kohana 3.1 module for using Pjax (pushState + ajax)
Simplistic Kohana 3 module implementation of Chris Wanstrath's defunkt jquery-pjax
Pjax allows ajax loading of web page subparts while keeping browser url and history behaviour intact.
NOTE: Pjax relies on HTML5 browser history.pushState - FF4+, Chrome9+ etc. - forget Internet Explorer!
Add the kopjax module to your Kohana 3.1(.2) installation. Navigate to http://[yourkohanainstallation]/pjaxdemo
This module includes a media controller for loading of the js files. If using in older Ko3 versions, there might be needed a change in the media controller (response->check_cache should be replaced with request->check_cache).
All credits to defunkt (Chris Wanstrath) and the Kohana team for keeping up the great work!