The renowned plug-in developer Chris Fullmer has created CLF OnScreen Display, the newest sketchup plugin that is compatible with SketchUp 7, SketchUp 8, SketchUp 2013, SketchUp 2014, SketchUp 2015, SketchUp 2016, SketchUp 2017, SketchUp 2018.
This script demonstrates the position of cursor and screen as well as the name of the chosen component. If there does not exist any chosen component, it labels what is selected (group, face, edge, 3d polyline, etc).
This tool can be activated from Plugins> OnScreen Display. After moving the cursor, left click and hold the mouse to obtain the OnScreen Display. When a component is chosen, it will demonstrate the instance name and the definition name. The definition is what is normally viewable in the component browser.
Watch the following video for online demonstration of the plugin.
The plugin is available in extension warehouse extensions.sketchup.com