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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 use phpenv personally, but using the official PPAs at https://deb.sury.org/ is the most maintainable. phpenv lets you set a PHP version per folder, globally, or even temporarily. I am constantly switching between PHP versions during the day and it was easier than messing around with update-alternatives (contrast with Java, where I use update-alternatives because the version switching is much less day-to-day for me)
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.