National Alliance on Mental Illness (NAMI) [0]. My mom has been actively involved since I was diagnosed with schizoaffective disorder 16 years ago. They help spread awareness of mental illness and have many programs that help educate not only those suffering but also the family members of those suffering from mental illness. One of the local chapters near me also provides temporary housing for those who are struggling with mental illness and are unable to hold down a job because of their illness.

[0] https://www.nami.org/