Zeal got Net Framework. The download for it is huge. And not particularly good. Lot of just class definitions with no guidance. DevDocs has a request/voting thingy (somewhere, I dont remember where, just that I’ve seen it) which documentation we want them to include next.
All these docs, both devdocs and zeal, is auto-generated from existing and publicly available docs. The doc apps only advantage is a single source and faster and easier search.