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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Go for Syncthing : https://syncthing.net/ It allows to sync any folder between any device/OS (even your phone). It's easy to use, you could even sync entire game folders if you want.
NOTE:
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Hence, a higher number means a more popular project.