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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.
Maybe look at MUD Pi. Are you sure you want to develop a MUD though? That will require you to create a server (possibly hosted through a paid platform like AWS or Heroku than if you plan to connect via a LAN then that won't be necessary). A single-player roguelike would be a bit easier.
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.