Please note that all files are provided with NO WARRANTY.
Most people will want the 32-bit version of ZHLT. If you don't know which one you need, download this one. Please note that, even if you have a 64-bit processor, you are most probably running 32-bit Windows. If you have a 64-bit processors, and are running Windows 64-bit, download the version for 64-bit processors.
There is also an updated build which improves RAD in development click here to visit this thread.
If you recive runtime errors, please download the Visual C++ 2005 Runtime Libraries Package:
There is a mostly untested ZHLT package for GNU/Linux, UNIX and POSIX systems and *BSD available here.
ZHLT 3.4 final source code (source code archive).
The development thread of ZHLT 3 can be found here.
A subsequent development thread extending ZHLT 3.4 Final can be found here.
The development thread of these old tools can be found here.
The development thread for Merl's Half-Life Tools was previously hosted on the Valve ERC Collective site. However, this site sadly no longer exists.
See this list of other useful mapping software for mapping for Half-Life, including map editors and other tools.