The National Suicide Prevention Lifeline is a United States-based suicide prevention network of over 160 crisis centers that provides 24/7 service via a toll-free hotline with the number 1-800-273-8255. It is available to anyone in suicidal crisis or emotional distress.
https://suicidepreventionlifeline.org/
The Trevor Project is the leading national organization providing crisis intervention and suicide prevention services to lesbian, gay, bisexual, transgender, queer & questioning (LGBTQ) young people under 25.
https://www.thetrevorproject.org/