7 or 8 years ago GVC and Zeroforum split ways (technically what happened was that vwvortex.com split from GVC, and the Zeroforum/rely.net relationship went with it). Some time after that, ZF stopped offering a software package at all - they only offered a hosted service that was prohibitively expensive for our small site.
ZF as a company is no more as far as I can tell based on 3 minutes of google research.
I'm in the process of contracting with a company called gConverter that will convert the site from ZeroForum to phpBB. I have done some google searches to see what people's satisfaction is with the company and the results seem to be generally good. Their website says that they are based in Wyoming but it also says that you get fastest results if you are in their timzone (GMT+2, aka Eastern Europe), so I'm guessing their team is mostly overseas which is why their rates are so competitive. I know that the File Attachement feature of ZF is a little unusal (phpBB3 might have it, I don't know), but I asked gConverter if file attachements will be preserved, and they said yes.
I hope to get the work done in the next 2 weeks once I have gotten the full details from them.
There will definitely be some growing pains, people are very used to ZF and we do have a few enhancements (Registry) that will require some extra work to port over, but I think that we will all benefit from moving to a platform that is current, supported, has available add-ons and gets security updates. (And is based on 2012 technology, rather than 2002).
I will do my best to make information available on the website when I have more information. Thanks for your patience!
I'm always glad to see we are still regularly getting new members to our community, and look forward to the next 10 years.