Deviare In-Process is described as 'code interception engine for Microsoft Windows®. It is a dual license library, GPLv3 and Commercial. The source code is available at GitHub' and is an app in the Development category. There are four alternatives to Deviare In-Process for Windows. The best alternative is WinAPIOverride. It's not free, so if you're looking for a free alternative, you could try HookInjEx or Mhook.
WinAPIOverride is an advanced api monitoring software for 32 and 64 bits processes. You can monitor and/or override any function of a process. This can be done for API functions or executable internal functions.
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? DETOURS VS.
Microsoft Research Detours v3 Professional is a library for instrumenting arbitrary Win32 functions on x86, x64, and IA64 machines. Now you can intercept Win32 functions by re-writing the in-memory code for target functions.