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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.
I wouldn't expect there to be a tutorial specifically for writing a file manager. (After all, the vast majority of people who write GUI apps for Linux never write a file manager.) But there is some documentation on how to write GUIs with Rust and GTK here https://gtk-rs.org/.
NOTE:
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Hence, a higher number means a more popular project.