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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.
We use PINES which is based on Evergreen, which is open-source. I believe there are vendors you can pay to help you set it up and run it, and there's a volunteer community that will help, too. Of course, this is at the expense of having someone else run it *for* you, but my understanding is that we (Georgia libraries that use PINES) decided to make the software to address limitations in existing ILSs. So, if your library wants to bring it in-house (so customer service etc. are not even an issue) might be worth a look!
NOTE:
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Hence, a higher number means a more popular project.