Linguist Jen Smith from UNC Chapel Hill has gathered a useful list of corpora. Here you can find corpora in different languages, e.g. French, German, Swedish, Icelandic, and Mandarin.
If you are looking for English corpora, linguist Mark Davies from Brigham Young University has created a comprehensive tool for searching in a variety of corpora in English. The site contains corpora of numerous English varieties, e.g. British, American, and Canadian, as well as some slightly less traditional ones like The TV Corpus and Corpus of American Soap Operas.