This Wiki uses DokuWiki, an application written in PHP. The basic look of the site is based a standard DokuWiki template tweaked to give it a similar look to previous iterations of the cam.* FAQ.
The http://misc.org.uk domain is owned by The Hug so http://cam.misc.org.uk is just a sub-domain used for the Wiki. Other sub-domains are used for other purposes.
It is now hosted by Ben Hutchings on a Linux server running Debian GNU/Linux.
See also funding the Wiki.