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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.
Nice. Before Facebook many people used multi-protocol clients like Miranda IM (dead but Miranda NG is alive, will soon support WhatsApp and Telegram), Pidgin (supports everything with plugins), QIP (died in 2015), but they are currently not available on phones, and I don't know what's available for phones.
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.