Young Minds provides advice and information on children with ADHD and autism and mental health.
ADHD UK provides advice and support for adults, parents and carers of those with ADHD. They also run a Facebook page for parents supporting those aged 18 and over.
Ambitious about Autism is aiming to help create a world where autistic children and young people are heard, included and supported.
The National Autistic Society offers advice and information, and also runs an online community for autistic people and their families to meet like-minded people and share their experiences.