I can't believe that I have missed this thread as this genre of writing helped to shape my politics, world-view and, most certainly, my feminism. In fact without being overly dramatic it is reading that has shaped my life.
I grew up in relative poverty, in a loving home but without access to books in the house. I could read at 3 years old, reading the Daily Mirror and the Bible) and fell in love with the mobile library at 5. I read voraciously but it was when working as a librarian in the 1970s, 1980s early 1990s that I came across the writers previously mentioned, including Marge Piercy, Sheri Tepper, Octavia Butler, Joanna Russ etc.
Also outside this genre , Alice Walker, Maya Angelou, Toni Morrison,
Their fiction helped me sense of the feminist and political theory I was also reading.
Can I recommend Starhawk? She is a wise pagan witch who has lived an amazing life of environmental and political activism. I love her writing, both non-fiction, centred on spirituality and living with-Earth rather than just on-Earth, and her dystopian/utopian visions set in the very near future and which seem ever more likely as the days pass.
Fifth Sacred Thing
Walking to Mercury this is a prequel to Fifth Sacred Thing and is a semi-fictionalised story of Starhawk's journey to becoming activist and witch. I often wish I had been as brave as she was rather than clinging to convention.
City of Refuge
Her other books including Spiral Dance the Empowerment Manual are very useful for those who wish to explore spirituality and politics or see them as fundamentally linked. My favourite is Earth Path, my copy is tattered and torn but much loved. Her writing on power and how it is exercised in capitalist, patriarchal society is excellent
I was delighted to see a new edition of Woman on the Edge of Time by Marge Piercy on the shelves at Waterstones. I would love to think this has been driven by the number of second-wave feminists who have recommended it to their younger sisters. Piercy and Tepper's works are amongst my favourite novels.
Thank you to the OP for starting this thread. It would be great if people came back to post how they feel about these books.