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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.
For example https://github.com/altmann/FluentResults is excellent if you want generic results
I also find myself using Maybe occasionally, I usually end up using this when I am working with a third party library that returns null on some methods.
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.