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doublecmd
Double Commander is a free cross platform open source file manager with two panels side by side.
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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.
Take a look at double commander: https://doublecmd.sourceforge.io/
However, if you use a desktop manager such as Xfce, the file manager (Thunar in this case) is built in and can be configured with traditional double window arrangement.
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.