WinAPIOverride - WinAPIOverride : This software allows you to monitor and/or modify any function of a process for any calling convention (stdcall or cdecl)
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).
HookInjEx - How to inject code into another processes address space, and then execute it in the context of this process.
EasyHook - The reinvention of Windows API Hooking
madCodeHook - "madCodeHook" offers everything you need to hook code (mostly APIs).
Gravitee.io - Gravitee.io is a flexible, lightweight and an open source API management solution.