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InfluxDB
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For proof you can read this github issue where one of the top contributors mentions that OpenJazz has no saving, since they want saves to be compatible with the original game, but the save format is encoded and needs to be reverse engineered first (means that they don't have the source of the original)
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.