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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.
You can try XMPP/Jabber: Check out Snikket on both Android and iOS if you want to set up your own server, or use Conversations on Android and Siskin on iOS to connect to any existing public XMPP server.
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.