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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.
Tk is best supported, looks a bit old fashioned but loads of resources available. Prima is pure Perl and deserves more community support. Wx looks fancy and modern, but there are some bugs with Image handling (work-around-able) in Linux systems. QT4 works and requires multiple rollbacks and enormous headaches on modern distros to install, and QT5 is not available. GTk (both 2.0 and 3.0) is by far the easiest to use IMO, and Win32::GUI is a viable for Windows app development. I also made an attempt some years back to make GUI design in Perl much easier...still an amateurish "work -in-progress".