1. Magento2 ProductattachmentThe Product Attachments extension for Magento 2 equips product pages with a special attachments block where you can upload numerous documents such as user guides, extra images, pdf, certificates, licenses and many others.
2. Magento2 BuynowThis module add "BuyNow" button on product view page and product list page to process directly checkout.
3. Magento2 FaqThis module adds an easy way to use FAQ Section to your Magento store with jQuery Accordion. In this module, admin can add and update FAQ. Admin can also create FAQ group with group icon.
4. magento2-extrafeeThis module is used to add extra fee to order. Show added extrafee in order, invoice and creditmemo.