XWinspector!

WinSpy++ is a handy programmer's utility which can be used to select and view the properties of any window in the system. WinSpy is based around the Microsoft Spy++ utility that ships with Microsoft Visual Studio.

Window Detective is a programmer's tool used to "spy" on an application's windows and allows you to view and even modify some of its properties.

Windows Enabler allows the user to enable disabled windows and controls such as buttons and tick boxes and choose menu options that would normally be disabled. This is obviously a very dangerous practice if used recklessly but having said that, you’d be surprised at how often it comes in handy. Windows Enabler has a very simple user interface; it appears as an icon in the system tray and can be turned on and off simply by clicking on it. Windows enabler may be freely distributed as long as the entire package (or a superset) is distributed unaltered. »

WinCheat is like Spy++ in that it lets you dig deep into the internals of the PE format and the Win32 Windowing subsystems.

WinDowse is an application to analyze the children from a window, result then an efficient and magnific application to analyze the Windows system structure.

Have you ever used Spy++ that comes with MSVC? If you have then you know what Winspector is - but take out all of the annoyances of Spy++ and add in a big bag of handy tweaks and features.

Spy++ (SPYXX.EXE) is a Win32-based utility that gives you a graphical view of the system’s processes, threads, windows, and window messages.

"ShoWin displays useful information about windows by dragging a cursor over them."

WinID is controls & windows identification utility that is both powerful and compact. Its main purpose is to give an easy way to retrieve information about Microsoft Windows controls visually right off the screen. WinID resembles Spy++ from the Microsoft Visual Studio toolset but it also incorporates lots of its own handy features.