At Backbase we used a heavily modified Discourse instance that served all of our product docs (rendered out of Asciidoc and Docbook).
About 1.5M documents, fully embedded in the Discourse ember framework. We had a custom Algolia search that included it all.
And we developed something using the gamification/badging to emulate Salesforce Trails.
Alas it was a closed community, so I don’t have a lot of visuals to share
Made a post years ago with some screenshots:
