Following is a list of text corpora in various languages. "Text corpora" is the plural of "text corpus". A text corpus is a large and structured set of texts (nowadays usually electronically stored and processed). Text corpora are used to do statistical analysis and hypothesis testing, checking occurrences or validating linguistic rules within a specific language territory.
Google Books Ngram Corpus
American National Corpus
Bank of English
British National Corpus
Corpus Juris Secundum
Corpus of Contemporary American English (COCA) 425 million words, 1990–2011. Freely searchable online.
Brown Corpus, forming part of the "Brown Family" of corpora, together with LOB, Frown and F-LOB.
International Corpus of English
Oxford English Corpus
Scottish Corpus of Texts & Speech
Corpus Resource Database (CoRD), more than 80 English language corpora.
Bulgarian National Corpus
CETENFolha
Croatian Language Corpus
Croatian National Corpus
Czech National Corpus
Google Books Ngram Corpus
Russian National Corpus
General Internet Corpus of Russian
Slovenian National Corpus
Thesaurus Linguae Graecae (Ancient Greek)
Eastern Armenian National Corpus (EANC) 110 million words. Freely searchable online.
National Corpus of Polish
German Reference Corpus (DeReKo) More than 4 billion words of contemporary written German.
Free corpus of German mistakes from people with dyslexia
Spanish text corpus by Molino de Ideas, which contains 660 million words.
CorALit: the Corpus of Academic Lithuanian Academic texts published in 1999–2009 (approx. 9 million words). Compiled at the University of Vilnius, Lithuania
Reference Corpus of Contemporary Portuguese (CRPC)
Turkish National Corpus
Hamshahri Corpus (Persian a.k.a. Farsi)
Persian in MULTEXT-EAST corpus (Persian a.k.a. Farsi)
Amarna letters, (for Akkadian, Egyptian, Sumerogram's, etc.)
TEP: Tehran English-Persian Parallel Corpus
TMC: Tehran Monolingual Corpus, Standard corpus for Persian Language Modeling
Persian Today Corpus: The Most Frequent Words of Today Persian, based on a one-million-word corpus (in Persian: Vāže-hā-ye Porkārbord-e Fārsi-ye Emrūz), Hamid Hassani, Tehran, Iran Language Institute (ILI), 322 pp. ISBN 964-8699-32-1
Kurdish-corpus.uok.ac.ir (Kurdish-corpus Sorani dialect) University of Kurdistan Department of English language and linguistics
Bijankhan Corpus A Contemporary Persian Corpus for NLP researches, University of Tehran, 2012
Neo-Assyrian Text Corpus Project
Quranic Arabic Corpus (Classical Arabic)
Kotonoha Japanese language corpus
LIVAC Synchronous Corpus (Chinese)
Europarl Corpus - proceedings of the European Parliament from 1996–2011
EUR-Lex corpus - collection of all official languages of the European Union, created from the EUR-Lex database
OPUS: Open source Parallel Corpus in many many languages
Tatoeba A parallel corpus which contains about 2288000 sentences in 122 languages.
NTU-Multilingual Corpus in 7 languages (ara, eng, ind, jpn, kor, mcn, vie) (legacy repo)
SeedLing corpus - A Seed Corpus for the Human Language Project with 1000+ languages from various sources.
GRALIS parallel texts for various slavic languages, compiled by the institute for slavic languages at Graz University (Branko Tošović et al.)
WaCky - The Web-As-Corpus Kool Yinitiative Web as Corpus (eng, fre, deu, ita)
Disambiguating Similar Language Corpora Collection (DSLCC) (Bosnian, Croatian, Serbian, Indonesian, Malay, Czech, Slovak, Brazilian Portuguese, European Portuguese, Peninsular Spanish, Argentine Spanish)
Wikipedia Comparable Corpora (41 million aligned Wikipedia articles for 253 language pairs)
List of text corpora Wikipedia (Text) CC BY-SA