Winspector Spy - Have you ever used Spy++ that comes with MSVC?
Process Explorer - The top window always shows a list of the currently active processes, including the names of their owning accounts, whereas the information displayed in the bottom window depends on the mode that Process Explorer is in: if it is in handle mode you'lโฆ
XWinspector - Discover hidden features of other software with XWinSpector.
glances system monitoring - Glances is a cross-platform system monitoring tool written in Python. Written in Python, Glances will run on almost any plaftorm : GNU/Linux, FreeBSD, OS X and Windows.
WinID - WinID is controls & windows identification utility that is both powerful and compact.
Process Lasso - Process Lasso is NOT yet another task manager.