Neurofeedback has been researched for more than 50 years. Below are links that will launch a search using Google Scholar of the most recent research publications on neurofeedback and these selected topics. 
ADHD
Addiction
Anxiety
Autism Spectrum Disorders 
Cognitive Performance
Depression
​Migraine
Neurofeedback Overview
OCD
Pediatric Autoimmune Neurospsychiatric Disorders (PANS and PANDAS)
Parkinson's Disease
​Peak Performance
Post-traumatic Stress Disorder
Run your own search using Google Scholar.