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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.
Adding a more private self hosted option, there is uMurmur [1] which is light-weight enough to run on a Linux router. One of the mobile apps that works with it is Mumla.
There is of course the full blown Murmur [2] install that works a little more like Discord in that people can create channels and there is a permission system.
[1] - https://github.com/umurmur/umurmur/wiki/Configuration
[2] - https://wiki.mumble.info/wiki/Main_Page
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.