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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.
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Baby Buddy
A :baby: buddy to help caregivers track sleep, feedings, diaper changes, and tummy time to learn about and predict baby's needs without (as much) guess work.
If you're up for self-hosting, there's BabyBuddy[0]. There's no first-party native app, but it is a decent web app and there's some third-party apps/integrations. And of course, multiple users is a priority. No affiliation, just a user :)
[0]: https://github.com/babybuddy/babybuddy
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.