#gnuplot turned 40 years old (!) back in December. Happy birthday!
#gnuplot was one of the very first tools I used for looking at data
it was 1995 and I was doing my first job (year out between school and uni) and the place had sunOS 4 workstations with 1-bit high-resolution monochrome displays iirc
the unix systems were locked down so there was no python or anything ... just fortran f77 and shell and gnuplot
(those constraints led me to prototype a linux-based data analysis workstation)