The project is hosted at the GForge server at Supelec (Metz, France). The source code of LuaTeX as well as some binaries can be downloaded here. The sources and binaries of MetaPost and MPlib can be found here The LuajitTeX code can be found here

For your convenience we have collected the latest stable binaries here. In order to prevent opening in your browser you can best click the right mousebutton and choose "save to disk."

windows  win32
linux   i586   x86-64   ppc
solaris  sparc   intel
os-x   intel   ppc   universal
freebsd  amd64   intel

If you want to run the latest greatest versions, please get the binaries from the Supelec server.