CartGifts allow you to offer a product as a free gift when order grand total is over a defined threshold.
You can choose any product of your catalog to be eligible for free gift setting a threshold for it within product page in Magento backend.
The whole selection of products will be proposed to customer directly at checkout and only products over the threshold are active and choosable enticing customer to increase order amount to get a more valuable gift.
Gift choosen by customer is automatically added to cart for free.

Cart Gifts is fully multi-store compatible.