Nobody has mentioned yet, window's own javascript compiler: http://msdn.microsoft.com/en-us/library/vstudio/7435xtz6(v=vs.100).aspx
Microsoft (R) JScript Compiler version 8.00.50727
for Microsoft (R) .NET Framework version 2.0.50727
Copyright (C) Microsoft Corporation 1996-2005. All rights reserved.
jsc [options]
There are usually a couple of copies lying around on any windows install, but they are not usually in the path, so you have to find them.
The compiler is capable of compiling javascript files into executables that can run on any windows machine with .NET installed.