The APA provides information about recent research and testing trends, reviews of published resources, and serves as a good general information site for testing. Their page on Finding Instruments About Psychological Tests (https://www.apa.org/science/programs/testing/find-tests) provides details on how to obtain testing instruments and give guidance on how to use resources to find the testing instruments.

The Buros Institute of Mental Measurements, publisher of Tests in Print and Mental Measurements Yearbook website offers tools that can help you obtain testing materials and reviews.

The Educational Testing Service's (ETS) website provides access to the ETS test collection database which contains over 25,000 testing devices.

This is a commercial site that offers assessments for clinical and psychological use. Tests are clearly explained for functionality and implementation. Tests can be purchased from this site.

This site offers free, but limited public access to their database. For each instrument in the database, you will find 14 categories of basic information (e.g., author, objective, mode of administration, original language, existing translations, pathology, number of items, etc.).