Ikiwiki supports using several revision control systems for storing page histories.
Ikiwiki started out supporting only Subversion, but the interface ikiwiki uses to a revision control system is sufficiently simple and generic that it can be adapted to work with many systems by writing a plugin. Subversion is still a recommended choice; git is another well-tested option.
These are all the supported revision control systems:
Git
Posted Mon Mar 28 19:24:16 2011
mercurial
Posted Mon Mar 28 19:24:16 2011
tla
Posted Mon Mar 28 19:24:16 2011
svn
Posted Mon Mar 28 19:24:16 2011
monotone
Posted Mon Mar 28 19:24:16 2011
bzr
Posted Tue Jan 29 21:02:25 2008
There is a page with details about how the different systems work with ikiwiki, for the curious.