BookStack is a simple, self-hosted, easy-to-use platform for organising and storing information with an opinionated modern interface and is built using PHP and the Laravel framework.
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Over 9 different languages are built in to BookStack which can be set at a per-profile level.
Pro Clean & simple default interface
The stock interface design has a modern feel and is simple for new users to use.
Pro Free and open source
Released under the MIT license.
Pro Full role and permissions system built in
Granular permissions can be set up for specific roles on a per-content basis and permissions will waterfall down to child content.
Pro Supports SSO using Google Apps
Very convenient when you're a company that uses Google Apps, that makes logging into Bookstack more secure and more convenient.
Pro Support for domain authentication
Can be deployed within an active directory environment with its features to connect over LDAP.
Con No support for readable markup languages
The content entered through the WYSIWIG editor is stored as HTML. The HTML can be edited directly, but no other markup language is parsed. Speak ReST, Markdown, etc.
Con Limited to 2 levels of content
Bookstack implements a "Book / Chapter / Page" system which works fine, but lacks flexibility when you need to have more levels of imbrication.
Con Limited customisability
Customisation options are limited with only the main theme color, logo and name being customisable.
Con Complicated installation
The current installation process involves many steps and may be a lot to take in for people not familiar with setting up Laravel applications.