Discy

Discy is beautifully designed for knowledgeable online communities, marketing websites, or any kind of developers community. It has a sleek and simple design that makes it perfect for question and answer type niche websites.
This theme is packed with extra power! Detailed question page, awesome poll page, and much more. Ensuring you a striking user engagement that will positively stick visitors with you.
Moreover, Discy allows managing all questions on the front end and sets members’ rules, and manages the community in a professional way.
However, if you wish to create and share a poll within a few seconds or pick/upvote an answer, need a user point & badges system. Discy has all the features that need to build a fully functional Q&A website.
So, what are you waiting for? go and grab this stunning solution that makes your Q&A website journey QUICK and EASY.
Ask Me

Ask me is a feature-rich WordPress theme for the Questions & Answers online community. The layout of Ask me fits on all screens and devices, from handheld and up to desktop computers.
It has modern profile pages, unique question pages, user points, and badges system, and much more.
The number of features and functions Ask me guarantees is tremendous. It ensures everybody benefits from it.
Speaking of unique question layouts, Ask me able to display all questions on one page of your choice, The question listing page is also packed with lots of features like filters, sorts, pagination, search etc.
Step into the online Q&A world with a BANG, attract new visitors, and help them to find what they are looking for.
InfoCenter

You can quickly and effortlessly build an online community for Help Desk, Knowledge Base, and Forum solution with InfoCenter. NO need to have any professional background at all, as InfoCenter won’t require coding and design expertise.
While if you need a one-page faq section to point users to? InfoCenter has a nice and smooth accordion implementation for the FAQs.
The theme is built to provide an effortless help desk support solution that will save time for both supporters and customers when working around issues, every single element in the theme has been developed very carefully to ensure this theme saves as much time as possible for users.
InfoCenter is a useful and comprehensive knowledge base solution for creating professional Q&A websites with WordPress.
Scisco

Scisco is a WordPress theme that enables you to create a professional online community website. Your new Q&A site will look clean, along with a set of powerful features, making it a fully-featured Q&A network like StackOverflow, Yahoo! Answers, or Quora.
Also, it is a fully functional job board theme. Allow your site members to create a job directory and to browse jobs by filters easily.
Moreover, With Scisco users are able to ask questions, answer questions, get reputation points, like/dislike answers, create front-end profiles, and much more…
See live preview and enjoy using the powerful features of Scisco now.
DW Helpdesk

Are you wishing to start Knowledge Base, Q&A, or FAQ online portal for your business? Then DW Helpdesk is the theme to build an effective helpdesk system that helps your client to solve their query.
Remember, you can use DW Helpdesk for building a support system environment that provides a knowledge base to Q&A, Glossary, and FAQ section about your services or products.
DW Helpdesk is entirely optimized to work on any device with its responsiveness and retina-ready quality, ensuring a killer performance. Of course, as a Q&A theme, DW Helpdesk provides you with 4 Premium Plugins for free.
DW Helpdesk ensures that the operation of your support center will be FLAWLESS with troubleshooting guides.
Aardvark – Community, Membership, BuddyPress Theme

AMA – Social Questions and Answers Figma Template

Lore – Elegant Knowledge Base WordPress Theme

AskBug

Answers
TechDesk – Responsive Knowledge Base/FAQ Theme

Knowledge Base – A WordPress Wiki Theme

Knowledge Base is a Premium WordPress Theme for Wiki and Knowledge Base Websites. It is a clean and feature rich solution to provide support & basic product knowledge to your customers. With the support of bbPress forums plugin, You can add your own support forums OR discussion forums on your website.
QAEngine

A new generation of WordPress Question and Answer theme; with a content-focused UX and a refreshing full-width layout design
Flatbase – A responsive Knowledge Base/Wiki Theme

Flatbase, a Knowledge Base & FAQ WordPress theme. The perfect theme to provide Support and interact with your customers. Flatbase, a nicely crafted and complete all-in-one solution to create your own support platform. Its clean and detail-oriented design is the perfect frame to provide support articles, informing and teaching users how to master your product.