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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.
https://shreddit.com/ being one of them which is also opensource https://github.com/andrewbanchich/shreddit
Just recently someone made a GreaseMonkey script that changes the frontend to look more old.reddit like. Usability features will come as fast as people can contribute the spare time and effort to add it in.
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.