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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.
The UI sources might be the best actual existing documentation on what's available, take a look here for example: https://github.com/Unity-Technologies/uGUI/blob/2019.1/UnityEngine.UI/EventSystem/EventInterfaces.cs
NOTE:
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Hence, a higher number means a more popular project.