Testimony

It seems to be one of the most capable, if not the most capable, of the WakkaWiki^[link1] forks. It can do files, comments, and cluster (see more in the docs). It's got a nice not-quite-WYSIWIG interface and can be integrated very elegantly into a web page. It's also really easy to install (even though the docs don't say that you have to create the config file in the main directory before the installation -- they just tell you to chmod it!). I had it up and running in like 5 minutes.

OMG. I spent the last few days searching for a Wiki engine to use for my Master Thesis. After looking at PmWiki, MediaWiki, TWiki, Trac, PhpWiki, DokuWiki and other engines, I must say this one seems the way to go. It comes with everything I need OutOfTheBox. I've used PmWiki before but this one seems great.