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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.
First, a word of caution. "Updating" a terminal or console is possible, but it is rife with gotchas and inconsistencies. The go to library/application for this type of interfaces is Curses. There are Ruby bindings, but this injects a system dependency that may or may not be available on a given platform. Also, Curses is way overkill if all you're doing is output.
NOTE:
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Hence, a higher number means a more popular project.