I was about a third of the way through Robert Jackson Bennett’s Foundryside when I realized I was reading a fantasy novel about the future.
Not in any literal sense, so far as I know; this is a secondary-world fantasy, set in a vaguely Renaissance-ish city-state. But the magic system in Foundryside is technological. I don’t mean that in a reversal-of-Clarke’s law sort of way; magic in Foundryside can be ineffable and slippery. What I mean is that it interacts with its society in many of the same ways information technology interacts with our own.