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toaststunt
A network accessible, multi-user, programmable, interactive system for the creation of MOOs / MUDs.
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mudmixer
MUDMixer is an add-on for MUD clients that enriches the gaming experience with connection mixing functionality and a variety of other features.
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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.
TLS support was recently added to ToastStunt, so any MOOs running that have the option. The biggest that come to mind are Miriani and ChatMUD. They also use argon2id for password hashing rather than the usual crypt(), if that sort of thing is important to you.
If sci-fi is your thing, Prometheus and Miriani both offer ssl/tls on ports 7777 and 1444 I think) respectively. If your client doesn't support tls/ssl, might I suggest mud mixer. Found at: https://github.com/tms88/mudmixer It supports connecting over tls, as well as a bunch of other features that you may or may not find useful.