Use the Toolbar Editor (Right-click the toolbar area > Customize) to drag all your favorite tools from these extensions onto a single toolbar. Rename it "My PowerBar." You have now rebuilt the JHS experience with stable, modern code.
(Paid - $15)
To understand the popularity of the JHS PowerBar, one must understand the culture of the SketchUp community. For years, the SketchUcation forums have been a breeding ground for innovation. JHS is a developer who has contributed numerous free tools to the community, but the PowerBar is arguably the most widely adopted.
SketchUp’s default selection tool is basic (Click, Shift, Ctrl). JHS introduced "Select by..." functions: