nopStation's Product Q&A plugin for nopCommerce lets you enable a Q&A section on your online store's product pages and set which customer roles are allowed to ask or answer questions. This plugin lets customers ask questions anonymously and lets the store admin approve or hide customer questions and answers as well.
Quick view plugin which displays product details in the popup window on the same page. It is very useful as customers don't need to navigate to the product page to see every product detail.