SabaiDiscuss is a top-notch plugin designed for WordPress that allows users to ask and answer questions in a format similar to popular sites like Stack Overflow and Yahoo Answers. This plugin is not only perfect for creating a community-driven question-and-answer platform, but it can also be used to set up a discussion forum, a knowledge base, or even a helpdesk portal on your WordPress website.
Take a look at a demo of SabaiDiscuss here.