The hist-pl-transliter package provides a simple embedded domain specific language for defining transliteration rules. Additionally, the package includes a set of rules prepared (within the SYNAT project) for documents collected throughout the IMPACT project (available at http://dl.psnc.pl/activities/projekty/impact/results/).
A transliteration system, developed independently within the IMPACT project, may be also of interest. It can be found at https://bitbucket.org/jsbien/pol.
Please see the Haddocks hosted on HackageDB: