Since it's come up a few times for me, and I imagine others might find it useful too.

Ren'py is a Python based visual novel engine for creating interactive stories. It's designed for stories which rely mainly on character sprites and dialogue, which means most of the code looks a lot like the script of a play. It's aimed at non programmers and relatively easy to use, but there's a few things that seem to trip everyone up when they start.
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