I vaguely remember a tool I used in the dark ages of PS 2.0. The best I can describe it is, you pipe an object to it, and it gives you a GUI that lets you "browse" or "explore" the object. It's sort of like Out-Gridview, but you can expand nested objects.
This is the closest I could find below. However, from the description it sounds like this Object Browser looks at Everything in the PowerShell Environment. https://web.archive.org/web/20210126090047/https://gallery.technet.microsoft.com/PowerShell-Object-Browser-847d62c1 (described here)
Does that sound familiar to anyone?