The supported Magento version is 1.9.x
- ajax navigation using history pushState/popState
- price slider with submit button
- SEO URLs (http://www.example.com/men/shirts/filter/fit/regular,sharp/sleeve_length/long-sleeve.html)
- multiple filters for the same attribute
- supports Magento Configurable Swatches
All the above features can be enabled/disabled from backend: "System -> Configuration -> Catalin SEO -> Catalog Layered Navigation"
You can install this module using Colin Mollenhour's Modman tool.
$ modman init
$ modman clone https://github.com/caciobanu/improved-magento-layered-navigation.git