The best Shell Extension alternative to Conky is XWidget, which is free. If that doesn't suit you, our users have ranked more than 25 alternatives to Conky and three of them are Shell Extensions so hopefully you can find a suitable replacement. Other interesting Shell Extension alternatives to Conky are Übersicht and BGINFO4X.
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/
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
BGINFO for X, also called BGINFO4X, is a clone of the popular program BGINFO for Windows created by Sysinternals.
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