UC Berkeley has licensed access to the full-text corpus data for the following BYU English language collections. You can search these corpora online without accessing the full-text data:
The full-text corpus data for COCA, COHA and GloWbE are each available through a Library/D-Lab partnership:
Note that each dataset is available in three different formats: Database, Word/lemma/PoS, and Linear text.
For more information about the data formats see corpus.byu.edu.