The project is primarily written in C++, while plugins can be written in either C++ or C#. The Rainmeter project was originally founded by Kimmo 'Rainy' Pekkola, the developer of Rainlendar, in 2001. Ĭommon functionalities of Rainmeter skins include desktop clocks, RSS readers, system monitors, weather widgets, application launchers and audio players. Ready to use collections of skins can be downloaded and installed in packages known as 'suites'. It allows users to create and display user-generated customizable desktop widgets or applets called 'skins' that display information. Rainmeter is a free and open-source desktop customization utility for Windows released under the GNU GPL v2 license.