Magento Catalog Extensions is a Magento module which implements infinite scrolling. It adds a "More products" button to the end of products pages that displays more products without reloading the page, and automatically reloads the page once the viewer reaches the bottom of a list or grid.
Magento Call for Price is a Magnento extension that displays custom text in place of “ADD TO CART”. This is useful when the store owner does not want to display the product price to the customer. Buyers can fill in their enquiry details in a pop-up form so that the owner can respond with the necessary price details.