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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.
That said, there are plenty of engines that support both. You're almost certainly welcome to take a look at Evennia's source code to see how they went about setting it up (Evennia has built-in telnet + websocket support, falling back on AJAX/COMET if the browser can't handle websockets). No need to reinvent the wheel from scratch if you can nab a roughly wheel-shaped block and carve it into what you want.
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.