Not working yet, but this is one of the goals of civlua
Basically it will be a from-scratch and ultra-simple version control system with support for forum-like "threads" as well as a directory structure. You could use it as a "wiki" by having changelists on the files and discussions via the forum. The idea is the whole stack can be hosted on the web.
It is still in the very early stages of development.
Best,
Rett