This document lists several websites that provide support and resources for positive mental health in teenagers. The websites include Young Minds which supports young people and their families on mental health and resilience, STEM4 which focuses on positive mental health for teenagers, and Mind which provides support and advice on mental health problems so no one feels alone. It also mentions Childline which offers a free 24-hour helpline for children and young people, and The Mix which supports anyone under 25 through various counseling services.