The best System Tweaker alternative to Open Shell is Classic Shell, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Open Shell and six of them are System Tweakers so hopefully you can find a suitable replacement. Other interesting System Tweaker alternatives to Open Shell are Start11, 7+ Taskbar Tweaker, Start8 and WindowBlinds.
Classic Shell is free software that improves your productivity, enhances the usability of Windows, and empowers you to use the computer the way you like it.
Enhance Windows 10/11 personalizing Start Menu and Taskbar with style changes, icon and section adjustments, taskbar improvements, quick access menus, and advanced search features for improved productivity.
Return the Start Button to Windows 8 With these features:
Customize Windows 10 and 11 with skins for Start menu and taskbar. Includes SkinStudio for designing skins, offering personalized fonts, and color and transparency adjustments.
bbLean is the lean version of Blackbox for Windows. It tries to keep balance between features and complexity, to give you some efficient means within a compact shell.
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I'm an IT / PC /Mac Network consultant. Classic shell is the original version of Open Shell. Open Shell still seems to work fine with Windows 10 v1903. I am not a big fan of the new Windows (formerly called "Metro") Interface, and install Open Shell on every W10 computer I use. My clients also are very pleased with it.