I've been trying to find organizations that support women's (sex based) rights and feminism from a radical / gender critical standpoint. These are the ones I've found so far--
Women's Declaration International -- Fights for women's sex based rights.
Women's Liberation Front -- Fights for women's sex based rights.
Culture Reframed -- Gail Dines' organization which fights against a pornified culture.
LGB Alliance -- Fights for gay rights & advocates for dropping the T. (There's one based in UK and one in the US.)
Any others you know of?