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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.
There are also tools like gnatcheck and CodePeer, but I don't know if there if there are free versions available. Some of the tools that used to require ASIS have switched to libadalang because ASIS works only with code that compiles.
NOTE:
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Hence, a higher number means a more popular project.