Support for Cyrillic scripts (Bulgarian, Russian, Serbian, Ukrainian), even if Latin alphabets may also be used.
This package includes the following CTAN packages:
babel-belarusian -- Babel support for Belarusian
babel-bulgarian -- Babel contributed support for Bulgarian
babel-russian -- Russian language module for Babel
babel-serbian -- Babel/Polyglossia support for Serbian
babel-serbianc -- Babel module to support Serbian Cyrillic
babel-ukrainian -- Babel support for Ukrainian
churchslavonic -- Typeset documents in Church Slavonic language using Unicode
cmcyr -- Computer Modern fonts with cyrillic extensions
cyrillic -- Support for Cyrillic fonts in LaTeX
cyrillic-bin -- Cyrillic bibtex and makeindex
cyrplain -- Support for using T2 encoding
disser -- Class and templates for typesetting dissertations in Russian
eskd -- Modern Russian typesetting
eskdx -- Modern Russian typesetting
gost -- BibTeX styles to format according to GOST
hyphen-belarusian -- Belarusian hyphenation patterns.
hyphen-bulgarian -- Bulgarian hyphenation patterns.
hyphen-churchslavonic -- Church Slavonic hyphenation patterns.
hyphen-mongolian -- Mongolian hyphenation patterns in Cyrillic script.
hyphen-russian -- Russian hyphenation patterns.
hyphen-serbian -- Serbian hyphenation patterns.
hyphen-ukrainian -- Ukrainian hyphenation patterns.
lcyw -- Make Classic Cyrillic CM fonts accessible in LaTeX
lh -- Cyrillic fonts that support LaTeX standard encodings
lhcyr -- A non-standard Cyrillic input scheme
lshort-bulgarian -- Bulgarian translation of the "Short Introduction to LaTeX2e"
lshort-mongol -- Short introduction to LaTeX, in Mongolian
lshort-russian -- Russian introduction to LaTeX
lshort-ukr -- Ukrainian version of the LaTeX introduction
mongolian-babel -- A language definition file for Mongolian in Babel
montex -- Mongolian LaTeX
mpman-ru -- A Russian translation of the MetaPost manual
numnameru -- Converts a number to the russian spelled out name
pst-eucl-translation-bg -- Bulgarian translation of the pst-eucl documentation
ruhyphen -- Russian hyphenation
russ -- LaTeX in Russian, without babel
serbian-apostrophe -- Commands for Serbian words with apostrophes
serbian-date-lat -- Updated date typesetting for Serbian
serbian-def-cyr -- Serbian cyrillic localization
serbian-lig -- Control ligatures in Serbian
t2 -- Support for using T2 encoding
texlive-ru -- TeX Live manual (Russian)
texlive-sr -- TeX Live manual (Serbian)
ukrhyph -- Hyphenation Patterns for Ukrainian
xecyrmongolian -- Basic support for the typesetting of Cyrillic Mongolian documents using (Xe|Lua)LaTeX