You won't find many common threads there. No tool (yet) designs an effective information architecture, consistent style, audience awareness, or comprehensive topic coverage. Those all have to come from the contributors.

Aside from providing a front end for viewing and maybe editing, docs publishing tools mostly help make that content more accessible, provide some search and versioning functionality, ease some maintenance tasks, provide static publishing options like PDFs, and handle asset management. Maybe you get luxurious and have an authoring/reviewing/publishing workflow from a headless CMS, but most shops these days just try to bend a software issue-tracking system into doing that.