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EasyHook starts where Microsoft Detours ends. This project supports extending (hooking) unmanaged code (APIs) with pure managed ones, from within a fully managed environment like C# using Windows 2000 SP4 and later, including Windows XP x64, Windows Vista x64 and Windows Server 2008 x64. Also 32- and 64-bit kernel mode hooking is supported as well as an unmanaged user-mode API which allows you to hook targets without requiring a NET Framework on the customers PC. An experimental stealth injection hides hooking from most of the current AV software.

The following is an incomplete list of features:

A so called "Thread Deadlock Barrier" will get rid of many core problems when hooking unknown APIs; this technology is unique to EasyHook
You can write managed hook handlers for unmanaged APIs
You can use all the convenience managed code provides, like NET Remoting, WPF and WCF for example
A documented, pure unmanaged hooking API
Support for 32- and 64-bit kernel mode hooking (also check out my PatchGuard 3 bypass driver which can be found in the release list)
No resource or memory leaks are left in the target
Source code was rewritten entirely and this will greatly improve performance, stability and maintainability
Experimental stealth injection mechanism that won't raise attention of any current AV Software
EasyHook32.dll and EasyHook64.dll are now pure unmanaged modules and can be used without any NET framework installed!
All hooks are installed and automatically removed in a stable manner
Support for Windows Vista SP1 x64 and Windows Server 2008 SP1 x64 by utilizing totally undocumented APIs, to still allow hooking into any terminal session.
Managed/Unmanaged module stack trace added
Get calling managed/unmanaged module inside a hook handler
Create custom stack traces inside a hook handler
You will be able to write injection libraries and host processes compiled for AnyCPU, which will allow you to inject your code into 32- and 64-Bit processes from 64- and 32-Bit processes by using the very same assembly in all cases.
EasyHook supports RIP-relative addressing relocation for 64-Bit targets.
License has changed to Lesser GPL (LGPL)
No unpacking/installation necessary anymore.
No CRT bindings for release configurations, reducing deployment size about some megabytes.
The Visual Studio Redistributable is not required anymore.
First feature complete release of EasyHook...