Active Minds — a non-profit organized specifically for students
Mental Health America — a community-based non-profit support group
PsychEducation.org — Don’t let the unprofessional formatting scare you away–this is one of the best sites I’ve found for information on bipolar disorder II (and other illnesses, though not as in-depth) I’ve found; his page on rapid cycling was a revelation and helped me understand myself and my illness even better.
Rethink Mental Illness — a group based in the UK
1-800-273-TALK (8255) — National Suicide Prevention Lifeline crisis line
1-800-231-1127 — crisis and resource hotline for Common Ground, offering help to those in distress or their loved ones