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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.
Rector is a free and open-source tool written in PHP allowing you to automate various refactoring tasks. It analyses your code and applies whatever rules you've specified in its configuration. It is also possible to create your own rules.
While it seems to be getting a little more traction recently, along with other static analysis tools like PHPStan, it is still very much underused. One of the reasons is probably that developers are unaware of its potential, of which the above is just a taste.
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.