The article presents the StimulStat database which includes more than 50,000 of the most frequent Russian words and their forms (> 1,700,000 units). These words are described in more than 70 different parameters that play an important role in linguistic and psychological research. The database can be used for stimuli selection in experimental studies of Russian. The database includes such parameters of lemmas and word forms as the number of letters and phonemes in the word, the number of syllables, frequency, phonological information (ideal and real phonemic transcription, stress position, syllabic structure of the word), morphological information for all parts of speech (including the inflectional Zaliznyak index), semantic information (the number of meanings) and information about orthographical and phonological neighbors (substitution neighbors, transposition neighbors, addition/deletion neighbors). To provide free access to the database, a web interface (http://stimul.cognitivestudies.ru) has been created.