We started using Slite http://slite.com/ 6 months ago with great success. We previously used Atlassian Confluence for our internal knowledge database, and it resulted in very static content and poor adoption. Slite is a much better choice: we use it for "static" company knowledge (like onboarding, processes, etc.), but also for most of our dynamic content (meeting notes, document drafting, sales support documentation, etc.).

Many people (including dev) use it on a daily basis, and most people on a weekly basis.

Definitely recommend.