madCodeHook - "madCodeHook" offers everything you need to hook code (mostly APIs).
Microsoft Research Detours - Detours is a software package for re-routing Win32 APIs underneath applications.
EasyHook - The reinvention of Windows API Hooking
Insomnia REST - The most intuitive cross-platform REST API Client ð´
WinAPIOverride - WinAPIOverride : This software allows you to monitor and/or modify any function of a process for any calling convention (stdcall or cdecl)
RESTer - A REST client for almost any web service (Firefox and Chrome extension).