CTAN (anacronym for "Comprehensive TeX Archive Network") is the authoritative place where TeX related material and software can be found for download. Repositories for other projects, such as the MiKTeX distribution of TeX, constantly mirror most of CTAN.
Before CTAN there were a number of people who made some TeX materials available for public download, but there was no systematic collection. At a podium discussion that Joachim Schrod organized at the 1991 EuroTeX conference, the idea arose to bring together the separate collections. (Joachim was interested in this topic because he is active in the TeX community since 1983 and ran one of the largest ftp servers in Germany at that time.)
CTAN was built in 1992, by Rainer Schöpf and Joachim Schrod in Germany, Sebastian Rahtz in the UK, and George Greenwade in the U.S. (George came up with the name).[1] Today,[when?] there are still only four people who maintain the archives and the TeX catalogue updates: Erik Braun, Ina Dau, Manfred Lotz, and Petra Ruebe-Pugliese. The site structure was put together at the start of 1992 – Sebastian did the main work – and synchronized at the start of 1993. The TeX Users Group provided a framework, a Technical Working Group, for this task's organization. CTAN was officially announced at the EuroTeX conference at Aston University, 1993. The WEB server itself is maintained by Gerd Neugebauer.
The English site has been stable since the beginning, but both the American and the German sites have moved thrice. The American site was first at Sam Houston State University under George Greenwade, in 1995 it moved to UMass Boston where it was run by Karl Berry. In 1999 it moved to Saint Michael's CollegeinColchester, Vermont. There it was announced to go off-line in the end of January 2011.[2] Since January 2013, a mirror has been hosted by the University of Utah[3] (no upload node). The German site was first at the University of Heidelberg, operated by Rainer; in 1999 it moved to the University of Mainz, also operated by Rainer; 2002 to the University of Hamburg, operated by Reinhard Zierke; finally in 2005 it moved to a commercial hosting company since the amount of traffic got too high to get sponsored by a university. The German site is subsidized by DANTE, the Deutschsprachige Anwendervereinigung TeX.
Today, the main CTAN nodes serve downloads of more than 6 TB per month, not counting its 94 mirror sites worldwide.
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