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Kurtzgesagt made a video explaining some possibilities. In short, you can throw mass or radiation at a spinning black hole and "steal" rotational energy from it.

https://www.youtube.com/watch?v=ulCdoCfw-bY

also, you can use light, instead of matter.

Termed the "halo drive", it's a very nice theoretical concept: https://www.youtube.com/watch?v=rFqL9CkNxXw

Heat water to produce steam, use steam to turn turbine. :P

steampunk had it right

Solar panels?

How about a big ol' waterwheel?