Best wiki editing experience I have ever used. Database tables for when you need fully structured data, Page Properties and the neat page properties report when you need just a bit of metadata. Absolutely insane number of add-ons available. The drag drop in the tree view navigation in particular blows my mind with just how good it is - it is the gold standard blueprint for how to do drag drop. It's the little touches like that that make Confluence delightful to use. Review collected by and hosted on G2.com.
Sometimes you need an add-on for the "but it's so obvious!" features, like a list of dropdown options when editing a page, or showing incoming links.
As with any documentation system, content can get stale. I've not yet found the magic technique to keep the content updated yet. Review collected by and hosted on G2.com.
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Organic review. This review was written entirely without invitation or incentive from G2, a seller, or an affiliate.