These are top and recommended Layered Navigation Extension For Magento Ecommerce

1) LandOfCoder Layered Navigation Extension
Are you looking for a fast, user-friendly navigation system which can allow your customers to browse your product catalog comfortably and impressively? Then, our new Layered Navigation Extension can satisfy you at the very first sight with its multiple filters, ajax load and user-friendly interface.
Link: https://landofcoder.com/magento-2-layered-navigation.html

2) CMSmart Layered Navigation Extension
Layered Navigation Extension for Magento 2 helps customers find their favorite products quickly. It is convenient save a huge time.
Link: https://cmsmart.net/magento-2-extensions/layered-navigation-extension-for-magento-2

3) manadev Layered Navigation Extension
Enables store customers to apply several options of the same filter.
Link: https://www.manadev.com/layered-navigation-filters-multiple-select-magento-2