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Another one is Other India Press.

https://en.m.wikipedia.org/wiki/Other_India_Press

https://www.otherindiabookstore.com/about

I got to know about them through coming across the book Tending the Earth, by Winin Pereira.

https://www.banyantreebookstore.com/product-page/tending-the...

I have some background in organic gardening, and think it is a very good book.

It is about more than just organic gardening, though.

I would add Stripe Press to this list.

https://press.stripe.com/

https://www.foliosociety.com/ is one of my favorites, the books are works of art.

New York Review Books [1] is another significant one. It's the publishing divison of the confusingly named The New York Review of Books, which is an amazing magazine (it's not really book reviews).

[1] https://www.nyrb.com/