Windows: Built-in desktop widgets left Windows with the end of the sidebar, but they’ve always been available with third party apps like the always-incredible Rainmeter. Win10 Widgets is a Rainmeter package that brings a lot of those informative widgets back to Windows in a way that looks natural in Windows 10.
Source: LifeHacker – Win10 Widgets Brings System Monitors and Other Native-Looking Tools to Your Desktop