HowHive Alternatives
HowHive is described as 'it's simple interface let's the team focus on finding and/or sharing knowledge fast and easy' and is an website. There are three alternatives to HowHive, not only websites but also apps for Self-Hosted solutions, Windows, Linux and Mac. The best alternative is Raneto, which is both free and Open Source. Other great sites and apps similar to HowHive are knowledge and openKB.
Raneto is an open source Knowledgebase platform that uses static Markdown files to power your Knowledgebase.
Free Knowledge Base System.
Features
openKB is a Markdown Knowledge base application (FAQ) built with Nodejs and ExpressJS. The application uses an embedded database (nedb) by default but can also use a MongoDB server.