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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.
I don't remember that happening? Rails does not handle Payment Card Information itself, it's just a web framework. Rails developers typically use 3rd-party plugins that safely handle the PCI data and integrate with a 3rd-party payment processor company, like Braintree or stripe-rails.
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.