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This website contains a corpus of the modern Russian language incorporating over 300 million words. The corpus of Russian is a reference system based on a collection of Russian texts in electronic form. The Corpus is intended for all who are interested in the Russian language and various associated fields: professional linguists, language teachers, school and university students, foreigners learning the language.

Corpus Diacrónico del Español  Spanish corpus including texts from many countries.

Corpus de Referencia del Español Actual Spanish corpus including texts from many countries.

Search interface for Corpus of Research Articles (English). All research can be searched, or by discipline or field/section.

Continuously updated corpus of American English with useful search interface. Genres are spoken, fiction, magazine, newspaper, and academic.

100-million-word Spanish corpus of text from 1200-1900s

Portuguese corpus.

The project of Arabic Learner Corpus (ALC) aims to provide a collection of written and spoken materials produced by learners of Arabic in Saudi Arabia.

Tool for searching for words or short phrases in a corpus. Provides the frequency of that word/phrase versus similar ones. Also provides alternatives based on learner errors. Limitations: English only

Corpus tools and word cloud. Enter a text or URLs.

German corpus. Das Digitale Wörterbuch der deutschen Sprache

Interface for searching scientific literature corpus.

Interface for accessing the Tsukuba Web Corpus. Includes tools for collocations.

This site allows you to see detailed information on the top 60,000 words (lemmas) of English, based on data from the Corpus of Contemporary American English (COCA). You can see the overall frequency for each word, as well as the frequency of words in different kinds of English -- spoken, fiction, magazines, newspapers, and academic writing. For each word you can also find the 20-30 most frequent collocates (nearby words) and see 200 or more concordance lines (words in context). You can also see a list of synonyms and (from WordNet) words with more specific and more general meanings, and in all of these cases you can click to see the entries for those related words as well.

You can enter any text that you would like in the form at the left -- for example, a paper that you've written, or a newspaper article that you've copied from another website. After inputting the text, you can then see useful information about words and phrases in that text, based on data from the Corpus of Contemporary American English (COCA). First, it will highlight all of the medium and lower-frequency words in your text and create lists of these words that you can use offline. This frequency data can help language learners focus on new words, and it can allow you to see "what the text is about" (i.e. text-specific words). You can also have it show you the "academic" words in your text. Second, you can click through the words in the text to see a detailed "word sketch" of any of the words -- showing their definition, and detailed information for the word from COCA -- collocates (which provide meaning into the meaning and usage of the word), re-sortable concordance lines, and the frequency of the word (overall, and by genre). Finally, you can do powerful searches on selected phrases in your text, to show related phrases in COCA. In this way, this resource is like a "collocational thesaurus" to see what related phrases are most likely in different styles of English. For example, if you click on the words potent argument in the text that you enter, it will suggest alternate ways to express this (e.g. powerful or convincing argument), and it will show you the frequency of those phrases in COCA -- overall, and by genre. This will help you use "just the right phrase", based on a huge collection of native English texts.

Tools for learners, teachers, and researchers. Learners can take tests, use concordance tools for reading, writing, and grammar. Researchers and teachers can determine the number of words at different frequency bands, etc. Limitations: English and French only

Generate word clouds that also allow you to see KWICs (key word in context). Limitations: No embed option.

Ludwig is a smart translator and linguistic search engine that compares a sentence that a user writes with comparable sentences from reliable sources. The program also has translation and dictionary functions. Read an article about this resource at https://techcrunch.com/2016/08/05/online-linguistic-search-engine-ludwig-helps-get-your-english-on/?ncid=rss

Text Inspector analyses the difficulty level of texts in English, giving you an instant score and detailed feedback.

Lists of core vocabulary in Latin and Ancient Greek.