There used to be a plugin for www.amember.com member management software but there is none now
Member management is important for sites with subscribers

? Who wrote the plug-in? It shouldn't be too difficult to update depending on how much editing needed to be done with the forum scripts.

I do not recall seeing such a plugin before

It was listed at http://amember.com/integration.php as one of the available extras for amember software

If that's the case, then likely it would have been them who had created the integration for their software.