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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.
There is also an Android app that scrapes preowneds and can send notifications about them. https://github.com/CherryPerry/Amiami-android-app But this one makes a full crawl only every hour.
NOTE:
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Hence, a higher number means a more popular project.