WinSpy - Retrieve window information.
SuperF4 - SuperF4 kills the foreground program when you press Ctrl+Alt+F4.
Winspector Spy - Have you ever used Spy++ that comes with MSVC?
Advanced Task Killer - This tool is also known as ATK. It is a tool to kill applications running.
Window Detective - Window Detective is a programmer's tool used to "spy" on an application's windows...
ProcessKO - ProcessKO free download: Process killer software for Windows. Safe PC download for Windows 32-bit and 64-bit, latest version.