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. These days, most people use git.
While all supported revision control systems work well enough for basic use, some advanced or special features are not supported in all of them. The table below summarises this for each revision control system and links to more information about each.
rcs_commit_staged yes yes yes yes yes yes no yesrcs_rename yes yes yes yes yes yes no yesrcs_remove yes yes yes yes yes yes no yesrcs_diff yes yes yes yes yes yes yes yesrcs_getctime fast slow slow slow fast slow slow slowrcs_getmtime fast slow slow slow fast no no norcs_preprevert yes no no no no no no norcs_revert yes no no no no no no noNotes:
rcs_commit_staged hook is needed to use attachments or comments. rcs_getctime and rcs_getmtime may be implemented in a fast way (ie, one log lookup for all files), or very slowly (one lookup per file). Openid username support allows avoiding display of Google's ugly openids.There is a page with details about how the different systems work with ikiwiki, for the curious.