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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.
As for the system, I can't comment as you haven't given even a single level for free. In contrast, AdaBots is open source, you can download it from github and use it if you are a programmer and want to teach children yourself, and I would urge you to do so since a real live human programmer is always going to be better than any automated system.
NOTE:
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Hence, a higher number means a more popular project.