EasyHook - The reinvention of Windows API Hooking
StatCounter - StatCounter is a simple but powerful real-time web analytics service that helps you track, analyse and understand your visitors so you can make good decisions to become more successful online.
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).
Histats - Start tracking your visitors in 1 minute!
madCodeHook - "madCodeHook" offers everything you need to hook code (mostly APIs).
Matomo - Matomo is an open-source web analytics platform