Puzzled you search the KB for internal needs of company employees, but for customers too (2 copies will be set, probably). Rummaged all Internet, anything not 100% found.
Loved the view www.kbpublisher.com/kb/
— however, you can buy it from the organization is not possible, because in Russia they are not represented, and to buy from a private person expensive. So please recommend a free or more or less adequate for the price (200 bucks) KB of the same type. The only more or less acceptable, I found myself demo.68kb.com/index.php
but still not what I would like.
I want the tree menu on the left, the ability to comment directly on the article page, the authorization system not only for admins but also for users, open source. Although open source cheat global authorization can, so don't so it is important for users.