The International Picture-Naming Project database at CRL-UCSD provides normed picture stimuli for downloading.

The MultiPic database of drawings includes 750 drawings normed in 6 different European languages (British English, Spanish, French, Dutch, Italian and German) provided by an international team of researchers.

Stimulus sets (pictures, videos) from COGSCIdotNL

WebCelex database (MPI Psycholinguistics)

Word frequencies in written and spoken English based on the British National Corpus (U Lancaster)

Word frequencies from the Corpus of Contemporary American English

Word frequencies based on subtitles (U Ghent)

Affective ratings for nearly 14 thousands English words (U Ghent)

The English Lexicon Project (U Washington at St. Louis)

Lexical database for psychological and linguistic research

WordNet - lexical database for English (U Princeton)

Edinburgh Associative Thesaurus

University of South Florida Free Association Norms

British National Corpus

Australian National Corpus

BYU collection of corpora

Corpus of Global Web-Based English (GloWbE)

Corpora from the Web (FU Berlin)

FALKO - annotated L2 German corpus (HU Berlin)

Child Language Data Exchange System (CHILDES)

The Oxford 3000 word list

ARC Nonword Database

IRIS - a digital repository of data collection instruments for research into second language learning and teaching

SubCat-Extractor - Induction of Verb Subcategorisation from Dependency Parses (U Stuttgart)

A Large Subcategorization Lexicon for English Verbs

The Language Goldmine is a website that provides links to several databases and -sets.