I have time-series data (daily values for a few years in CSV) that I want to plot for personal, casual use. I want to pan around, zoom in/out, and quickly check individual values with one or more cursors, much like what one would do with an oscilloscope.
Currently I'm making do with spreadsheet software and their plots, but they rather generate static, nice-looking graphs for a few hundred data points at most, and get awkward with bigger data sets and hardly allow any exploration. Google spreadsheets are slightly better than LibreOffice, Apple Numbers or Excel, but still is barely adequate.
Trading charts get close to what I would like regarding the exploration freedom (see https://iguanacharts.com/ ) , though I wouldn't need the crazy analysis/graphing extras.