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Signal-Server
Server supporting the Signal Private Messenger applications on Android, Desktop, and iOS
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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.
Ideally https://matrix.org/ but while decentralized is better, it's also harder and many of your friends won't be able to figure out how to find a server.
Funnily enough, when they got all the criticism after announcing this new "feature" they immediately updated the Signal-Server source code on GitHub, something they hadn't done in months: https://github.com/signalapp/Signal-Server
about signal suing people - haven't heard of it, need to look into that. but signal does have other clients, some are even on fdroid, like this one: https://github.com/mollyim/mollyim-android and there is honestly a tonn of signal forks and unconnected client implementations, including cli tools and daemons, i even use some myself for automated notifications