This is a non-technical question, but certainly relevant for the TCS community. If considered inappropriate, feel free to close.The Complexity Zoo webpage (http://qwiki.stanford.edu/index.php/Complexity_Zoo) has certainly been of great service to the TCS community over the years. Apparently it is down since quite a while. I was wondering, if someone is still maintaining it, if it has moved, if there is a backup server, or if there are other plans to preserve this wonderful database of complexity classes, their relationships and citations to relevant publications. If not, are there comparable webpages that could be used as a replacement?UPDATE (Aug 1): The Zoo is back online, and Scott is looking for people volunteering to mirror it to avoid any future outages.
Is there a backup/replacement for the Complexity Zoo?
cc.complexity theory;reference request;soft question
I cannot remark on whether the Zoo has a continuous existence on the web or elsewhere. However, there are still some proto-Zoo and Zoo-derived resources available on the web.There seems to be a copy of at least an earlier incarnation of the Zoo on Greg Kuperburg's UC Davis website.A Latex/PDF version of some state of the Zoo written by Chris Bourke seems still to be available on his webspace at the University of NebraskaLincoln.Other sources on the net seem to be links to the first (or to the URL to the stanford.edu subsite), or pieces of the second.It is worth noting that the entire qwiki.stanford.edu subsite seems to have disappeared, and that google searches for qwiki, with or without specifying stanford, either yields references to a multimedia product launched in January of last year, or produces the typical spoor of SEO companies trying to leach off of online resources.