Rainmeter is a free and open-source desktop customization utility for Windows released under the GNU GPL v2 license.

[5] Common functionalities of Rainmeter skins include desktop clocks, RSS readers, system monitors, weather widgets, application launchers and audio players.

[6][7] The Rainmeter project was originally founded by Kimmo 'Rainy' Pekkola, the developer of Rainlendar, in 2001.

[4] CNET, in a 4 out of 5 star rating, praised the software's flexibility, wide variety of themes and "enthusiastic community", while noting the program "isn't as intuitive as it could be.

"[11] Softpedia also gave the software a 4 out of 5 star rating, citing its comprehensive tutorials and low system resource usage, while criticizing its lack of cross-platform support.