Just looking at my bookshelf:

Women, Race and Class and Whipping Girl have both been mentioned but I'll reiterate those.

All of Alexandra Kollontai's writings are really good, if a bit outdated in terms of sex work and women's roles as mothers.

Patriarchy and Accumulation on a World Scale by Maria Mies is a good intro to Marxist feminism

Ain't I a Woman by Bell Hooks is a good black feminist perspective, as is Sister Outsider by Audre Lord

Leslie Feinberg's works are all great, and while they're focused on trans issues they intersect a lot with feminism.