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
Valgrind - Valgrind is an instrumentation framework for building dynamic analysis tools.
OProfile - OProfile is an open source project that includes a statistical profiler, capable of profiling all running code at low overhead.
EasyHook - The reinvention of Windows API Hooking
VisualVM - VisualVM is a visual tool integrating several commandline JDK tools and lightweight profiling...
Microsoft Research Detours - Detours is a software package for re-routing Win32 APIs underneath applications.