List of resources that I found useful:

Corpus/Lexical database

NINJAL: web interface for searching Balanced Corpus of Contemporary Written Japanese: BCCWJ

Coca corpus: browser-searchable Corpus of Contemporary America English

English Lexicon Project: English lexical database, good for finding lexical characteristics (frequency, orthographic neighbors, average lexical decision time etc)

Wordnet: English lexical database, good for finding lexical relationships.

Picture database

International Picture Naming Project at UCSD: object and action pictures, with behavioral data associated with them.

Experiment

Psychopy: free, flexible, cross-platform stimulus presentation software.

R: free cross-platform data analysis software