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Rainmeter
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Rainmeter is a free and open-source desktop customization utility for Windows and macOS, released under the GNU GPL v2 license. It allows users to create and display user-generated customizable desktop widgets or applets called "skins" that display information.
Stable release: 4.3.1 - r3321 / September 22, 2019; 16 months ago
Preview release: 4.4 - r3410 / November 14, 2020; 2 months ago
Operating system: Windows 7 SP1 and later
Programming languages: C++, C#
Platforms: x86-32 (32 bit Intel x86), x86-64.
Safety?

Is Rainmeter Safe to Install? The rainmeter application is fairly safe to use on a computer. Rainmeter is proven to be free of harmful viruses from the test results with 50 antivirus software. Rainmeter also uses only a small amount of memory capacity (only 1.66 KB for version 3.3).