The original 1.0 version was written by mangaman from NukeWorks. It looks as though it was based on the original PHP-Nuke Newsletter module as well as had some concepts from Fancy Newsletter, but not 100% sure on that.
Due to the almost full re-write nature of version 1.3, translations were not available. As they come available, this text will be updated with the appropriate credits.
Additional Thanks:
Additional thanks go to the following people for their help along the way:
Raven from http://ravenphpscripts.com for his excellent support site, excellent web hosting and encouragement along the way.
Guardian from http://www.code-authors.com for his constant nagging ( LOL ) for new releases, a few bug fixes, for his help in testing, helping to keep an eye on the support forums, and as a contributing editor to the on-line documentation!
Kguske from http://nukeSEO.com for his excellent integration of the FCKEditor into PHP-Nuke by way of his tool nukeWYSIWYG!