API Monitor - API Monitor is a software that monitors and displays API calls made by applications and services. Its a powerful tool for seeing how Windows and other applications work or tracking down problems that you have in your own applications
SpyStudio - SpyStudio is the best product to trace user-mode API calls on Windows.
Valgrind - Valgrind is an instrumentation framework for building dynamic analysis tools.
Clam Sentinel - A free & full-featured real-time scanner for ClamWin Antivirus.
WinAPIOverride - WinAPIOverride : This software allows you to monitor and/or modify any function of a process for any calling convention (stdcall or cdecl)
Process Monitor - Monitor file system, Registry, process, thread and DLL activity in real-time.