Don't be tired of mouse-clicking on a big graphics tool, to draw a 3D structure. Canvas Commander suggests a scripting way of modeling, where easy commands in a text file create, move, rotate, scale and paint 3D objects.

canvas 400 300 pers 400 300 500 10000 clear 0.0 0.0 0.2 light -1 1 1 move 0 0 -800 rotate 45 -1 1 0 scale 80 80 80 ** H2 molecule shine 50 1 1 1 move 0 0 -2.5 * H atom: r=1 diffuse 1.0 0.0 1.0 sphere 30 30 round * move 0 0 1 push * Bond: l=3 scale 0.5 0.5 3 diffuse 0.0 0.0 1.0 cylinder 1 10 360 15 round * pop move 0 0 4 * H atom: r=1 diffuse 1.0 0.0 1.0 sphere 30 30 round * ** finish