NW.js is a production-grade runtime that enables building native desktop applications using web technologies (HTML, JavaScript, CSS). It embeds a customized Chromium browser as the rendering engine and bundles Node.js for backend logic, providing a unified JavaScript environment across both client and server sides. The architecture is a monolith with separate browser and renderer processes communicating via IPC, and a rich C++ API layer exposed to JavaScript through extension functions and object managers. Key entry points include `nw_base.cc` for initialization, `nw_package.cc` for loading and parsing `package.json` manifests, and `nw_content.cc` for integrating Node.js with Chromium's lifecycle. External dependencies are heavy: a forked Chromium, a bundled Node.js, FFmpeg for media, and numerous third-party libraries (OpenSSL, ICU, etc.). The runtime provides native desktop integration APIs (menus, system tray, global shortcuts, clipboard, screen capture, printing) and supports cross-platform deployment on Windows, macOS, and Linux. The codebase is actively maintained with a large test suite, but carries significant technical debt from two parallel build systems (GN and GYP), duplicated API implementations, and extensive platform-specific patches that increase maintenance burden.