Fast, offline, and free documentation browser for developers. Search 100+ docs in one web app including HTML, CSS, JavaScript, PHP, Ruby, Python, Go, C, C++, and many more.
Nice website. There is also Zeal: https://zealdocs.org/ and for other type of documents. There is Kiwix: https://kiwix.org , which I use to download the entire Wikipedia.
You can just transfer the files and it should find them again. I did that with Kiwix and Zeal, if I'm not mistaken. Nowadays I don't use Zeal, but don't remember having such a trouble when installing a new os and taking old HDD over.
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.