World Loanword Database: http://wold.clld.org/

CORPORA

COHA Corpus of Historical American English (1810-2009) — http://corpus.byu.edu/coha/

COCA Corpus of Contemporary American English (1990-2012) — http://corpus.byu.edu/coca/

TIME Magazine Corpus (1923 — 2006) — http://corpus.byu.edu/time/

http://www.ling.upenn.edu/hist-corpora/