Achenbach System of Empirically-Based Assessment (ASEBA) - publisher of the Child Behavior Checklist and other behavior checklists
Checkmate Plus - publisher of the Child, Adolescent, and Adult Symptom Inventories
MHS Assessments - test publisher
Pearson Assessments - publishers of the Wechsler scales and many other widely used tests
Pro-Ed - publishers of tests including several popular achievement tests
Psychological Assessment Resources (PAR) - publisher and reseller of many psychological tests
Psychological Corporation - now part of Pearson Assessment, publishers of many clinical psychological tests, including the Wechsler scales
Stoelting Co. - publisher of the Leiter, Stroop Color-Word Test, and numerous other products
Test of Variables of Attention (TOVA) - test of attention and concentration
Western Psychological Services - publisher of cognitive and personality tests