This wiki has for a long time used DokuWiki, simply because I find it the best and easiest to use wiki software available (originally I used WakkaWiki, but that was an even longer time ago). My other websites originally used a home grown engine for static content which was migrated to Alfresco a few years ago.
However, keeping those sites uptodate has been a lot of pain and effort, so slowly they are being migrated to DokuWiki. The Yags website has now been migrated, and the last one left is the main website at http://www.glendale.org.uk/.
When that gets moved, this wiki and the main site will probably merge. The point of having a separate wiki site was to make it easy to record stuff, but if the main site is just as easy to update, then it doesn't make much sense to have two different sites. The only real advantage is that this wiki could be viewed as temporary content, and links may get broken over time.
There's a lot of content on the main site however, so it may not be until the end of the year when the final migration happens. There's a lot of dynamic content as well (I make heavy use of Alfresco's web scripts, which are a nice feature) which will need migrating in some way, which may require coding. Possibly an excuse to try out node.js, but I'd prefer to keep things simple.