LDC – Linguistic Data Consortium
http://ldc.upenn.edu/

ELRA (European Language Resources Association)
http://www.icp.grenet.fr/ELRA

Progetto Gutemberg
http://www.gutenberg.net/

The Oxford Text Archive (OTA)
http://ota.ox.ac.uk/

Internet Corpora (Sharoff)
http://corpus.leeds.ac.uk/internet.html