D3DWindower has been discontinued. Similar apps include DxWnd, which is free and open source. Other options are WinExplorer, zeckensack's Glide Wrapper and DirectX OpenGL Wrapper. In total there are four Window Managers like D3DWindower for Windows.
Windows hooker - intercepts system calls to make fullscreen programs running in a window, to support a better compatibility, to enhance video modes and to stretch timing. It is tipically very useful to run old windows games.
For every window in the hierarchy, you can view its properties, like handle, class name, caption, size, position and more. You can also modify some properties, like Caption and Visible/Enabled.
Israel
It implements and emulates the 3dfx Voodoo cards' native Glide2 and Glide3 APIs on top of OpenGL
DirectX OpenGL Wrapper emulates API calls thru OpenGL commands and other platform specific commands in order to run DirectX 8 application running on other platform than Windows.
France
EU