Masm32 is a software packet which includes tools to build Win32 applications with Masm. It contains: The Masm32 licence is limited to create binaries for MS Windows (see details here), which sounds strange and might limit its usefulness. The license also tells that Masm32 cannot be used to create "open source" software ( which is pure nonsense of course ).

There's also a forum for Masm32. Be aware that it isn't a generic "assembly language forum", it's rather about programming Win32 applications in (Masm-style) assembly.