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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.
It's relatively simple, think of PHP more like C# than node, the syntax is similar, you just don't have to compile the code :) Learn Composer which is the best package manager at the moment.
Some will, but only at a simple level such as "this private method is not used". If you want proper dead code detection, you might want to look into using Tombstones: https://github.com/scheb/tombstone
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.