Seelen UI

Fully customizable desktop environment replacement for Windows 10/11 with tiling and theming.

PlatformWebfree

Seelen UI is an open-source desktop environment replacement for Windows 10/11, reworking the taskbar, dock, app launcher, window manager, and notification flyouts. It adds tiling window management, CSS/JSON-based theming, wallpaper-derived accent colors, and a widget plugin SDK. Aimed at Windows power users who want deep visual and workflow customization beyond what the stock shell allows.

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