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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.
I use Pidgin on desktop and found a custom plugin that re-allows you to connect to Facebook's messaging service. I'm basically invisible and when someone sends me a message, it shows up in Pidgin but doesn't send a read receipt or let others know I'm typing back (even though I can see when they're typing).
PixelFed: Instagram Alternative
Mastodon: Twitter Alternative
Aether: Reddit Alternative
Friendica: Facebook Alternative
diaspora*: Google+ Alternative
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.