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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.
Couple of resources to start with. This article describes different roles of SAP professionals. ABAP Starter is a great resource for anyone thinking about learning ABAP. Most of SAP development still revolves around ABAP. There are other specializations these days but there is already competition from trained developers and learning curve might be too challenging.
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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.