MULTEXT-East is a multilingual dataset for language engineering research and development. This standardised and linked set of resources covers a large number of mainly Central and Eastern European languages and includes the EAGLES-based morphosyntactic specifications, defining the features that describe word-level syntactic annotations; medium scale morphosyntactic lexica; and annotated parallel, comparable, and speech corpora. The most important component is the linguistically annotated corpus consisting of Orwell's novel "1984" in the English original and translations. MULTEXT-East has already seen several editions, with the latest one being Version 3, where the most important addition has been that of Serbian language resources. The paper presents MULTEXT-East Version 3 with special emphasis on the Serbian components, namely the structurally annotated "1984", the morphosyntactic specifications, the morphosyntactic lexicon and the linguistically annotated "1984". The complete dataset, unique in terms of languages and the wealth of encoding, is extensively documented, and freely available for research purposes.