I run one PmWiki, just because someone else set it up. So I haven't dug too much into it, but the more I do, the more I like it. It's pretty scrappy, but very customisable. I guess similar reasons to why I like Textpattern, but maybe even more-so.
I dunno, here're a bunch of links:
There are a bunch of skins on the wiki, but to make the choice easier you may as well skip to the 'responsive web design' category:
Felix Pleşoianu has some tidy ones on this page:
PmWiki syntax is pretty standard, but there are some nice features:
Ran into some trouble with an old install and found a bunch of preg_replace with /e modifier deprecated
in my error_log
.
Debugging info here: http://www.pmwiki.org/wiki/PmWiki/Troubleshooting was useful.
$EnableDiag = 1;
in local/config(.php)
[wikiaddress][wikistartpage]?action=ruleset