Base is a powerful WP theme specially designed for knowledge bases, help articles and FAQ. The theme includes a special categories widget and theme shortcodes. It supports 4 custom post formats: image, gallery, video (self-hosted and embedded) and audio. There are related posts and "like this" functions, as well as a widget area generator.
This knowledge base WordPress theme is mobile responsive, so it looks great on small screen devices. It includes extensive theme options (custom background, drop-in header, choosing home & footer templates, etc). The theme includes a custom 404 page. There are many custom widgets to choose from: Flickr, Dribbble, Twitter, newsletter, social profiles, custom categories, featured widget (flip cards) custom sticky widget (featured posts), and more.