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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 thing I always loved about Traveller was not actually its depth, but its width. The sandbox that is https://travellermap.com I cannot imagine duplicating. It's defined enough that players can explore the map and say Oh Awesome We Should Go There. And yet sparse enough that I still get to write everything up as they come across it. It is a huge trellis upon which to grow the vine of your choice.
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.