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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.
Check out QMole - it's not exactly xfce, but it's close to what you want since it has the heavy lifting of porting common *nix utils and libraries to iOS. I haven't got it working myself, since I keep running out of space on my root parition, but maybe you'll have better luck.
NOTE:
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