Basically what the title says^

TESNexus Search for "prison" - http://www.tesnexus.com/downloads/search.php?name=Prison&scid=20&author=&mname=&desc=&size1=&size2=&downloads1=&downloads2=&udate1_day=&udate1_month=&udate1_year=&udate2_day=&udate2_month=&udate2_year=&ldate1_day=&ldate1_month=&ldate1_year=&ldate2_day=&ldate2_month=&ldate2_year=&endorsemants=&images=&readme=&advltonly=&page=1&orderby=downloads&order=DESC <-- check out the populated prisons mod

Well what do you mean by "Prison mods"? You could mean any number of things. Personal prisons, prison enhancements, etc etc