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sqlitebrowser
Official home of the DB Browser for SQLite (DB4S) project. Previously known as "SQLite Database Browser" and "Database Browser for SQLite". Website at:
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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.
The ping digest idea is closely related to another idea I had for tracking group activity, so I've added it as a comment here
The other nice thing about sqlite is there are existing tools (eg this db browser) to browse and manipulate your data, so you don't need to create your own tools.
NOTE:
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Hence, a higher number means a more popular project.