Graph paper replacement software : preferred Linux

I need to do something in openGL which forces me to take a pencil and a paper to do graphwork. I would like to know if there is free program to do that. It have Axes (X-Y-Z) and I can plot let say a cube and get coordinates. Sorry but complex program for modelling like blender are not option here. I need something to replace simple coordinate geometry I could do on paper. No fancy color, material or anything of that sort. Than开发者_如何学运维ks

Geogebra is a perfect solution!