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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.
Based on your comment, I assume you mean a GUI program for interactive exploration and manipulation, rather than a library?
This was posted on HN a few months ago and came to mind: https://github.com/facontidavide/PlotJuggler
In a past job, we used the commercial app nCode Glyphworks for graphical / interactive signal processing from field tests with hundreds of sensors.
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.