Rainmeter!

The Open Hardware Monitor is a free open source software that monitors temperature sensors, fan speeds, voltages, load and clock speeds of a computer.

Conky is a free, light-weight system monitor for X, that displays any kind of information on your desktop. Originally a fork of Torsmo, Conkys torsmo-based code is BSD licensed. New code in Conky has been licensed under the GPL 3.0.

SidebarDiagnostics - A simple sidebar for Windows desktop that displays hardware diagnostic information.

This is a port to OS X El Capitan 10.11 of MenuMeters by Alex Harper.

XWidget is a free desktop customization platform. It’s light, handy with powerful visual widget editor and very subtle animations. The Android page is found here: http://android.xwidget.com/

GeekTool is an application for Mac OS 10.6+. It lets you display various kinds of information on your desktop via 3 default plug-ins:

How many times have you walked up to a system in your office and needed to click through several diagnostic windows to remind yourself of important aspects of its configuration, such as its name, IP address, or operating system version If you manage multiple computers you probably need BGInfo. It automatically displays relevant information about a Windows computer on the desktops background, such as the computer name, IP address, service pack version, and more. You can edit any field as well as the font and background colors, and can place it in your startup folder so that it runs every boot, or even configure it to display as the background for the logon screen. »

Use stunning live wallpapers on your desktop. Create your own custom wallpapers and share them on Steam Workshop!

GKrellM is a single process stack of system monitors which supports applying themes to match its appearance to your window manager, Gtk, or any other theme.

Create you own designs and display any data you need, at once, and with wonderful animations too! If you were looking for Rainmeter or Conky on Android, this is it!

Übersicht lets you run system commands and display their output on your desktop in little containers, called widgets. Widgets are written using HTML5, which means they

The BitBar app lets you put the output from any script or program right in your Mac OS X menu bar. And it's completely free. An impressive number of plugins have already been contributed by a wide range of developers just like you, and this site makes it easy to find them.

8GadgetPack makes it possible to use gadgets on Windows 8 / 8.1 / 10.