National Sexual Violence Resource Center

This organization focuses on prevention of and responding to sexual violence. There's a plethora of resources especially around the annual Sexual Assault Awareness Month or SAAM. In addition, their website says they promote research in the area of sexual violence.

I love the work RAINN does. With a large support structure which includes authors and celebrities, they have an expansive reach. They have rape crisis counseling but also focus on childhood sexual assault and it's impact. Recommended tools can also be found on the site.