Rainmeter.net
http://www.rainmeter.net/

Rainmeter is a Windows customization application.

Rainmeter is a Windows customization application. Empower your desktop with an expandable library of useful tools – handy notes and application launchers, weather and feeds from the web, system status and more. Then, rearrange and modify them to suit your personal style. With Rainmeter, your desktop is finally yours.

Reader YBoris's desktop completely replaces the Windows interface with LiteStep—a minimalist, functional, and infinitely hackable shell replacement.

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