Layered Navigation Magento Extension allows store owners to enhance their website's usability by letting users to browse products by different attributes like brand, size, color, price etc. These are Ajax based filters which do not require page reloads. However the admin can enable / disable page reloads from back office. It is an SEO optimized module that automatically removes links to avoid duplications. Layered Navigation is a free module that support all Magento editions from 1.4 to 1.9.
Magento Community Edition 1.4 - 1.9