Z Desk is a helpdesk ticket system with a knowledge base and frequently asked questions, designed for creating helpdesk tickets.
Demo: https://codecanyon.net/item/z-desk-support-tickets-system-with-knowledge-base-and-faqs/33454477
FAQ Prite is a powerful Elementor plugin that creates eye-catching FAQ tab designs to answer all your visitors’ questions.
Demo: https://codecanyon.net/item/wiloke-faqs-prite-elementor-addon/40034714
WooCommerce FAQ plugin enables you to display store FAQs on separate page as well as product related FAQs exactly on product pages. Your customers can also use a smart "ask a question" form to ask send new questions.
Demo: https://codecanyon.net/item/woocommerce-product-faqs-plugin-ask-a-question/20451491