Official repo for the Hacx 2.0 project. http://www.drnostromo.com/hacx/
Building the project is simple -- simply have GNU Make and the 'zip' utility installed (generally included in most Linux distros, and easy to install via package manager if not).
Windows versions of these tools are pretty easily found as well. Search "GnuWin32" or "Gnu on Windows" (GOW) if you haven't just yet.
make
gzdoom -iwad dist/hacx.pk3
Or
eternity -iwad dist/hacx.pk3
HacX is currently under a custom noncommercial license provided by Banjo Software and Rich Johnston. See Legal.txt for more details -- Though the wording is mainly geared toward older HacX versions (1.2 and the earlier, original Banjo releases), it applies to this project too for the time being.