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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.
You can modify this line: https://github.com/marcinkoziej/org-pomodoro/blob/master/org-pomodoro.el#L534
with one of this options: https://github.com/jwiegley/alert#builtin-alert-styles libnotify works with KDE AFAIK.
NOTE:
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Hence, a higher number means a more popular project.