plotdrop(1) on Linux
The text cb00098d60f4, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
PlotDrop is designed for quick simple visualisation of 2D data series. It is a minimal Gnome frontend.