The Museum of Menstruation is full of interesting facts about menstruation and menstrual products throughout history, going as far back as Greek philosophers.
A comprehensive site available in English and Spanish, giving women information on sexual healthcare, birth control, abortion and more. Provides personal stories, poety, and how to perform a self-exam with a speculum.
A comprehensive resource on all things dealing with women's health and health issues, aimed at women and medical professionals. While there is lots of technical information, the site offers a wiki, forums and more.
Offered by Tampax.com, Being Girl is a website that gives women information on menstrual products, Toxic Shock Syndrome, a period calendar, a Q&A section and more.