VisualVM - VisualVM is a visual tool integrating several commandline JDK tools and lightweight profiling...
madCodeHook - "madCodeHook" offers everything you need to hook code (mostly APIs).
OProfile - OProfile is an open source project that includes a statistical profiler, capable of profiling all running code at low overhead.
Microsoft Research Detours - Detours is a software package for re-routing Win32 APIs underneath applications.
MemoryLogic - MemoryLogic offers tools to add process id and memory usage in rails logs and to track memory leaks.
Deviare API Hook - Deviare is a professional open source hooking engine for instrumenting arbitrary Win32 functions, COM objects, and functions which symbols are located in program databases (PDBs).