Nucleus is the Kotlin framework for native desktop apps. Combined with Compose Multiplatform, it forms the most complete desktop application stack ever built.
401
Enables creation of cross-platform system tray applications with native support, offering dynamic menu items, submenus, HDPI improvements, single instance management, and tray position detection using a DSL-style syntax.
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Cross-platform WebView component exposing WebViewState and navigator APIs; backed by native OS webviews via Rust+UniFFI (Wry), with JS-native bridge, cookie API, request interceptor.
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macOS‑26 visual system delivering 30+ native‑feeling components, light/dark theming, built‑in design tokens (colors, Manrope typography), animations, and zero external UI dependencies.
20
Fluent Design component library providing comprehensive UI controls, themed Mica/Acrylic layers, full RTL mirroring, reduced recompositions for performance, and decorated windows with native backdrops.
4
Reimplements Ubuntu's Yaru design language into a widget toolkit: 50+ components, 29 accent variants, light/dark/high-contrast themes, RTL, GNOME-style decorated windows.