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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.
There is also:
- Jami (https://jami.net/)
There's also Session, which runs their own p2p network of onion routers as a part of their blockchain initiative [1].
Status is another, which runs p2p waku nodes and is heavily connected to Ethereum [2].
Neither of them requires a phone number, plus both are open-source and p2p.
[1] https://getsession.org/
[2] https://status.im/
a couple more alternatives:
https://mega.io/
https://tox.chat/
Mega has a chat, phone and video calls
Tox is actually quite decentralized (I think you cannot be more decentralized than p2p), but has many inconveniences of not being cloud based
EDIT: readability