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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.
If you play online, or have a laptop with you, keep 1-2 tabs open with either https://2e.aonprd.com/Search.aspx or https://pf2easy.com/ . Unlike 5e, there are really good free tools to search through rules for any book, and being able to actually read word for word abilities makes it wayyyy easier to answer questions as a DM
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.