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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 called "User Agent Sniffing" because you're going to look at the User Agent header in the HTTP request to figure out what browser has requested the site. There are libraries for it like this one: https://github.com/WhichBrowser/Parser-PHP
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.