The Mental Measurements Yearbook series provides a comprehensive guide to over 2,700 contemporary testing instruments containing information essential for a complete evaluation of test products within such diverse areas as psychology, education, business, and leadership.

Also produced by the Buros Institute of Mental Measurements at the University of Nebraska, Tests in Print (TIP) serves as a comprehensive bibliography to all known commercially available tests that are currently in print in the English language. Tests in Print provides vital information including test purpose, test publisher, in-print status, price, test acronym, intended test population, administration times, publication date(s), and test author(s). A score index assists users to identify what is being measured by each test.

For more information, see the publisher's site.

These two products are the standard tools used to identify commercially available tests that can be used to assess a number of situations.  

Tests in Print provides a comprehensive bibliography of available tests, while Mental Measurements Yearbook provides reviews of tests. 

Not all tests listed in Test in Print will be covered in Mental Measurments Yearbook.  Tests in Print does not include all known tests either.  The publishers intentionally omit research and proprietary instruments.