Slavs
Standardised Slavic languages that have official status in at least one country are: Belarusian, Bosnian, Bulgarian, Croatian, Czech, Macedonian, Montenegrin, Polish, Russian, Serbian, Slovak, Slovene, and Ukrainian.
Literary language
Slavonic-Serbian ("slavenosrpski") was the literary language of Serbs in the Habsburg Monarchy used from the mid-18th century to 1825. It was a linguistic blend of Church Slavonic of the Russian recension, vernacular Serbian (Štokavian dialect), and Russian. At the beginning of the 19th century, it was severely attacked by Vuk Karadžić and his followers, whose reformatory efforts formed modern literary Serbian based on the popular language, known as Serbo-Croatian.