I just read Elegy Beach by Steven Boyett (a sequel to Ariel, but written a decade later), and thought it quite good (posits The Change which eliminated technology and make magic possible). But Sean McMullen's Souls in the Great Machine and sequels are a favorite- again a world without technology and some really interesting and fun concepts. Also Kristine Kathryn Rusch (The Disappeared and sequels), KristineSmith (Code of Conduct and sequels), William Dietz' Legion of the Damned series, and the Tanya Huff Valor novels.
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