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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.
If you want the app to be open sourced and work offline try Aard 2. I personally prefer Dictionary - Word Web (not open sourced), but has a widget, decent interface and works offline. Can be found on the playstore.
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.