DidiWiki is a small and simple WikiWikiWeb implementation written in C. It's intended for personal e.g. notes, TODO lists etc. It includes its own webserver and, hopefully, it's as simple as compiling, running and pointing your browser at it. As from version 0.5, DidiWiki has a very simple REST-like HTTP API. Hopefully, this will make it possible to write alternate frontends.
Created attachment 94266 [details] didiwiki-0.5 ebuild
Now in the Sunrise overlay: http://www.gentoo-sunrise.org/sunrise/browser/reviewed/www-apps/didiwiki
Moved to webapps overlay, with Debian patches now. Upstream went MIA, so extremely unlikely to ever get into official tree. http://overlays.gentoo.org/proj/webapps/browser/experimental/www-apps/didiwiki