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InfluxDB
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doukutsu-rs, which can also be used with CS+ data files (not included, for obvious reasons) and implements a number of features from CS+ (like cutscene skip, support for CS+ soundtracks, graphics, and challenges if you're using those data files, and local 2-player co-op). The mechanics are pretty accurate to the original game, with only a handful of minor inconsistencies which I'm sure will be fixed eventuallyâ„¢ as the engine is still actively in development.
NXEngine, later NXEngine-evo: While these engines are notable for historical reasons (and being ported to a bazillion different platforms over the years), they're very inaccurate to the original game so it's hard to recommend these anymore.