I'm really struggling to find a solution for a Knowledge Base in SharePoint 2013.

When I think "Knowledge Base"  I think of an application that allows the admins (and possibly other users) to post questions and answers for common problems.   Those questions/answers will be categorized and be searchable.

Usually there is a list of most popular questions on the front page, as well as being navigable via the categories etc.

I have used cloud based knowledge base solutions alot in the past (SafeHarbor for example), and written them from scratch in .Net, but I have searched and searched for a SharePoint based App or other solution for a SP Knowledge Base, and so far don't see anything that fits anywhere near those simple requirements.

I have also researched using a SP Blog or Wiki, but they just don't quite cut it, and certainly aren't an out of the box solution.

Any thoughts or ideas? I'm sure I'm overlooking something here.. Thanks.

The key must-have features for a successful Knowledge Base (IMHO) are ease of adding KB articles, article review and article search. To this end, I believe the closest (Note, I said closest, not the best :) ) to this is Sharepoint Wiki Libraries.

A Wiki Library is similar to a Document Library in that it contains documents.  The documents contained in the Wiki Library are web pages (.aspx).  These web pages allow you to create and customize content displayed in SharePoint sites.  The default page of the Team Site template is a wiki page.  Wiki pages may contain free-form content as well as web parts.  This allows you to create very simple to very elaborate browsing experiences for users.  Multiple wiki pages can together form some larger piece of enterprise content. 

Further reading and practical example available here: http://www.aspe-it.com/blog/2015/how-to-use-wiki-libraries-in-sharepoint-201

I've been looking heavily at using a Wiki as a solution.  So far it is the best option I have found...I'm still hoping something exists as a more "Typical" knowledge base solution.  Something that won't need to be highly customized to meet the basic functionality I've come to expect in a knowledge base.

Thanks for the input, I will research using a Wiki Library further...

I have created an Enterprise Wiki with reusable content to ensure consistency of formatting and layout across the pages created. It isn't great but just about works in the absence of a better solution.