DevDocs: Offline API Documentation as a Progressive Web App
DevDocs combines multiple API documentations in a fast, organized, and searchable interface.
Source: DevDocs API Documentation
This is really well done. Reminds me of a concept I had before called Airplane Mode (archived).
I installed this today after realizing it’s the first day of (basically) online-only school where I live and that that might cause problems. At least I can look up documentation offline now. :)