Those are replacing what Windows calls the "shell" and what is commonly called Explorer. They don't, AFAIK, replace what we would call the Window Manager and what most people don't have a name for, because it can't be replaced.
I distinctly remember being able to do things like collapsing windows to title bars by triple-clicking or adding extra buttons to window titlebars.
Window manager variety
Posted Apr 16, 2012 18:51 UTC (Mon) by sorpigal (subscriber, #36106)
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WindowBlinds was not a replacement window manager for Windows. It merely did some hackery to change some of the look and some behaviors and it always ran on top of the existing WM. Think of it more like a very-heavy theme. In the end things like window lists, window position and stacking order were still the same. In addition, it was awfully slow and memory hungry.