WinAPIOverride!

API Monitor is a Windows program that lets you monitor and control API calls made by applications and services. Its a powerful tool for seeing how applications and services work or for tracking down problems that you have in your own applications.

Deviare In-Process is a code interception engine for Microsoft Windows®. It is a dual license library, GPLv3 and Commercial. The source code is available at GitHub.

How to inject code into another processes address space, and then execute it in the context of this process.; Author: Robert Kuster; Updated: 21 Aug 2003; Section: Threads, Processes & IPC; Chapter: General Programming; Updated: 21 Aug 2003

If you dabble in this area then you’ll already know that Microsoft Research's Detours pretty much sets the benchmark when it comes to API hooking. Why don't we get a comparison out of the way quickly then?