List of lexical databases (non-exhaustive)
Focused on frequency and lexical characteristics
Celex (Dutch, English, German; frequencies, phonology, orthography, morphology)
Webinterface: http://celex.mpi.nl
Manuals: http://www.ldc.upenn.edu/Catalog/docs/LDC96L14/
Source files: http://crr.ugent.be/*****
BNC (British English; frequencies)
Sources: http://www.kilgarriff.co.uk/bnc-readme.html
Lexique (French; frequencies, phonology, morphology, reaction times)
Web-interface: http://www.lexique.org
Sources: http://www.lexique.org/telLexique.php
Subtlex-US (American English; subtitle frequencies)
Subtlex-NL (Dutch; subtitle frequencies, parts of speech)
http://crr.ugent.be/subtlex-nl/
Subtlex-CH (Chinese; Subtitle frequencies, parts of speech)
http://expsy.ugent.be/subtlex-ch/
Subtlex-GR (Greek; Subtitle frequencies)
http://www.bcbl.eu/databases/subtlexgr
Subtlex-DE (German; Subtitle frequencies)
http://crr.ugent.be/subtlex-de/
Subtlex-ESP (Spanish; Subtitle frequencies)
http://crr.ugent.be/archives/679
Subtlex-PL (Polish; Subtitle frequencies, parts of speech)
http://crr.ugent.be/programs-data/subtitle-frequencies/subtlex-pl
SUBTLEX-UK (British English; Subtitle frequencies, parts of speech)
http://crr.ugent.be/archives/1423
SUBTLEX-PT-BR (Brazilian Portuguese; Subtitle frequencies)
http://crr.ugent.be/programs-data/subtitle-frequencies/subtlex-pt-b)
SUBTLEX-PT (Portuguese; Subtitle frequencies)
http://p-pal.di.uminho.pt/about/databases
Google Books Ngrams (n-gram frequencies)
DLexDB (German, lexical statistics)
Malay Lexicon project (Malaysian, lexical statistics)
http://brm.psychonomic-journals.org/content/supplemental
Wordnet (American English; Semantics)
http://wordnetweb.princeton.edu/perl/webwn
MRC Psycholinguistic Database (English; Frequency, Imageability, Phonology, Age of Acquisition, ...)
http://www.psy.uwa.edu.au/mrcdatabase/uwa_mrc.htm
Irvine Phonotactic Online Dictionary (English; Phonology)
Focused on chronometric variables
English Lexicon project (English; Frequencies, Lexical Decision and Naming Reaction Times)
http://elexicon.wustl.edu/default.asp
Dutch Lexicon project (Dutch; Frequencies, POS and Lexical Decision Reaction Times)
http://crr.ugent.be/idlp/App.html
British Lexicon project (British English; Frequencies, POS and Lexical Decision Reaction Times)
http://crr.ugent.be/programs-data/lexicon-projects
The International Picture Naming Project: norms for timed picture naming in seven different languages (American English, German, Mexican Spanish, Italian, Bulgarian, Hungarian, and the variant of Mandarin Chinese spoken in Taiwan)
http://crl.ucsd.edu/experiments/ipnp/
BALDEY : auditory lexical decision experiment with 5,541 Dutch content words
http://www.mirjamernestus.nl/Ernestus/Baldey/
Chinese Lexicon project (Chinese; character statistics; Lexical Decision Reaction Times)
http://link.springer.com/article/10.3758%2Fs13428-013-0355-9
Semantic Priming Project (speeded naming and lexical decision data for 1,661 target words, preceded by semantically related and unrelated primes)
http://www.montana.edu/wwwpy/Hutchison/attmem_spp.htm
Form Priming Project: lexical decision data on 420 target words, each of which was presented in 27 different priming conditions
http://www.adelmanlab.org/fpp/
Focused on subjective ratings
Age-of-acquisition (AoA) norms for over 50 thousand English words
http://crr.ugent.be/archives/806
Affective ratings for nearly 14 thousand English words
http://crr.ugent.be/archives/1003
Concreteness ratings for 40 thousand English lemmas
http://crr.ugent.be/archives/1330
AoA norms and Concreteness norms for 30,000 Dutch words
http://crr.ugent.be/archives/1602
Norms of Valence, Arousal, Dominance, and AoA for 4300 Dutch words
http://crr.ugent.be/archives/878
See also the supplemental archive of Behavior Research Methods