Lightweight terminal-based mathematical function plotter.
Termplot supports vim-like commands, so you can type
:plot sin(x^2)
And it will work. Termplot can also plot implicit functions, like
:plot x^2+y^2 = 1
В зависимостях — termbox (или ncurses)
Скриншот есть по ссылке
https://github.com/gciruelos/termplot
P.S. Мопед не мой.