When comparing Ikiwiki vs Gitit, the Slant community recommends Gitit for most people. In the question“What are the best multi-user wikis?” Gitit is ranked 4th while Ikiwiki is ranked 16th. The most important reason people chose Gitit is:
Giti has a multitude of formats that it allows to be exported, including LaTeX, ConTeXt, DocBook, RTF, OpenOffice ODT, and MediaWiki markup.
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Pros
Pro Supports multiple human-readable text markup languages
ikiwiki supports Markdown, Creole, reStructuredText and Textile.
Pro Good tagging system
Pro Built-in attachment versioning
Pro Can substitute talk pages with blog-style comments system
Pro Uses version control systems to store pages
ikiwiki stores pages in Git, SVN and other version control systems.
Pro Lots of export formats
Giti has a multitude of formats that it allows to be exported, including LaTeX, ConTeXt, DocBook, RTF, OpenOffice ODT, and MediaWiki markup.
Pro Supports markdown
Getit supports markdown, a plain text formatting syntax that is designed so that it can be read by HTML.
Pro Free and open source software (FOSS)
Licensed under GPLv2 so you can download source code and customize to meet your needs, provided that you know or are willing to learn Haskell.
Pro Can be used collaboratively by multiple people
Pro Renders math
Using MathJax.
Cons
Con No email notifications
Con No WYSIWYG editor
Con Requires Haskell
On some Linux platforms a binary package for Haskell may not be included in the standard repositories. So, it will be necessary to compile Haskell from source code or find a non-standard package repository, which may seem like a hassle if you don't use Haskell for anything else.