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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.
However when it comes to other applications, e.g. using GTK, you have to use X11 protocol server, either directly rendering to screen (like https://github.com/pelya/xserver-xsdl) or network-based, e.g. Xvnc from tigervnc package - will require VNC viewer. There no way to output X11 graphics directly to Android OS, you will need a some middleware like mentioned XSDL or VNC viewer for that.
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.