If you are looking for the official DASS materials or psychometric software tools to process them:
The DASS is a world-renowned set of three self-report scales designed to measure the negative emotional states of depression, anxiety, and stress. dass284 full
The scales are used by clinicians and researchers to assess the severity of core symptoms and track treatment progress over time. The Role of "dass284" in Psychometrics If you are looking for the official DASS