Below is a list of organizations that support the transgender community. 

GLAAD. Resources for cisgender people who have questions about the trans community:

GLSEN. Resources for supporting trans and gender non-conforming students. 

Transgender Day of Remembrance: November 20 is commemorated every year as the "Transgender Day of Remembrance," a time when we remember the many transgender victims of violence worldwide.

Additional resources (courtesy of GLADD):