European Network for HIV/STD Prevention in Prostitution (EUROPAP)
Europap promotes health, safety, and effective public policy in regard to work in Europe.

HIPS (Helping Individual Prostitutes Survive)
HIPS provides services for young male, female, and transgender individuals engaging in various forms of sex for gain on the streets of Washington, D.C. HIPS staff, board, and volunteers work primarily through harm reduction models to assist street-based sex workers in identifying the skills they need or already have to make healthier life choices for themselves.

HookOnline Resources
A site maintatined by and for sex workers, HookOnline provides a wealth of information on health, advocacy, finances, and other subjects.

Network of Sex Work Projects (NSWP)
Based in Cape Town, South Africa, the NSWP is an international organization that promotes sex workers' health and human rights.