DevDocs is described as 'Aggregates multiple programming documentations in a web UI offering instant search, offline access, mobile support, dark theme, keyboard shortcuts, and ad-free use' and is a very popular documentation browser in the development category. There are more than 10 alternatives to DevDocs for a variety of platforms, including Linux, Flathub, Mac, Windows and Web-based apps. The best DevDocs alternative is Zeal, which is both free and Open Source. Other great apps like DevDocs are Code Wiki, Dash for macOS, Velocity and Read The Docs.
It's a native Windows app so it doesn't need a browser to run