I wrote a small package manager for newlisp. You can download it at http://artfulcode.net/projects. You can download the first version directly here: http://static.artfulcode.net/nl-install ... .1.tar.bz2.
I added a repository for my own modules at artfulcode.net. If you keep your own repository of newlisp modules, it's simple to set them up as a repository for nl-install. Once a few have been added, I will put up a listings page for them.