I have posted this before, but I’ve been working on a wrapper for OpenTTD to turn it from a game to a (slightly!) more serious system for research/experimentation, especially using its AI system:
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There was only one I could find: "exploring the performance of trAIns". I looked at the "trAIns" link and cannot understand what it does, other than being GPL licensed.
It's all very cryptic, without any explanations. To me that stands for "if you don't know already, you need not apply". Too bad.